blob: 00861e2d9e4b56c114a4dcae71fdbb0f89a996aa [file] [log] [blame]
wdenkfe8c2802002-11-03 00:38:21 +00001/*
2 * sh.c -- a prototype Bourne shell grammar parser
3 * Intended to follow the original Thompson and Ritchie
4 * "small and simple is beautiful" philosophy, which
5 * incidentally is a good match to today's BusyBox.
6 *
7 * Copyright (C) 2000,2001 Larry Doolittle <larry@doolittle.boa.org>
8 *
9 * Credits:
10 * The parser routines proper are all original material, first
11 * written Dec 2000 and Jan 2001 by Larry Doolittle.
12 * The execution engine, the builtins, and much of the underlying
13 * support has been adapted from busybox-0.49pre's lash,
14 * which is Copyright (C) 2000 by Lineo, Inc., and
15 * written by Erik Andersen <andersen@lineo.com>, <andersee@debian.org>.
16 * That, in turn, is based in part on ladsh.c, by Michael K. Johnson and
17 * Erik W. Troan, which they placed in the public domain. I don't know
18 * how much of the Johnson/Troan code has survived the repeated rewrites.
19 * Other credits:
wdenkfe8c2802002-11-03 00:38:21 +000020 * b_addchr() derived from similar w_addchar function in glibc-2.2
21 * setup_redirect(), redirect_opt_num(), and big chunks of main()
22 * and many builtins derived from contributions by Erik Andersen
23 * miscellaneous bugfixes from Matt Kraai
24 *
25 * There are two big (and related) architecture differences between
26 * this parser and the lash parser. One is that this version is
27 * actually designed from the ground up to understand nearly all
28 * of the Bourne grammar. The second, consequential change is that
29 * the parser and input reader have been turned inside out. Now,
30 * the parser is in control, and asks for input as needed. The old
31 * way had the input reader in control, and it asked for parsing to
32 * take place as needed. The new way makes it much easier to properly
33 * handle the recursion implicit in the various substitutions, especially
34 * across continuation lines.
35 *
36 * Bash grammar not implemented: (how many of these were in original sh?)
37 * $@ (those sure look like weird quoting rules)
38 * $_
39 * ! negation operator for pipes
40 * &> and >& redirection of stdout+stderr
41 * Brace Expansion
42 * Tilde Expansion
43 * fancy forms of Parameter Expansion
44 * aliases
45 * Arithmetic Expansion
46 * <(list) and >(list) Process Substitution
47 * reserved words: case, esac, select, function
48 * Here Documents ( << word )
49 * Functions
50 * Major bugs:
51 * job handling woefully incomplete and buggy
52 * reserved word execution woefully incomplete and buggy
53 * to-do:
54 * port selected bugfixes from post-0.49 busybox lash - done?
55 * finish implementing reserved words: for, while, until, do, done
56 * change { and } from special chars to reserved words
57 * builtins: break, continue, eval, return, set, trap, ulimit
58 * test magic exec
59 * handle children going into background
60 * clean up recognition of null pipes
61 * check setting of global_argc and global_argv
62 * control-C handling, probably with longjmp
63 * follow IFS rules more precisely, including update semantics
64 * figure out what to do with backslash-newline
65 * explain why we use signal instead of sigaction
66 * propagate syntax errors, die on resource errors?
67 * continuation lines, both explicit and implicit - done?
68 * memory leak finding and plugging - done?
69 * more testing, especially quoting rules and redirection
70 * document how quoting rules not precisely followed for variable assignments
71 * maybe change map[] to use 2-bit entries
72 * (eventually) remove all the printf's
73 *
Wolfgang Denk1a459662013-07-08 09:37:19 +020074 * SPDX-License-Identifier: GPL-2.0+
wdenkfe8c2802002-11-03 00:38:21 +000075 */
Wolfgang Denk1a459662013-07-08 09:37:19 +020076
wdenkfe8c2802002-11-03 00:38:21 +000077#define __U_BOOT__
78#ifdef __U_BOOT__
79#include <malloc.h> /* malloc, free, realloc*/
80#include <linux/ctype.h> /* isalpha, isdigit */
81#include <common.h> /* readline */
Simon Glass24b852a2015-11-08 23:47:45 -070082#include <console.h>
Simon Glass0098e172014-04-10 20:01:30 -060083#include <bootretry.h>
Simon Glass18d66532014-04-10 20:01:25 -060084#include <cli.h>
Simon Glasseca86fa2014-04-10 20:01:24 -060085#include <cli_hush.h>
wdenkfe8c2802002-11-03 00:38:21 +000086#include <command.h> /* find_cmd */
Tom Rini219f4782012-06-19 15:54:35 -070087#ifndef CONFIG_SYS_PROMPT_HUSH_PS2
88#define CONFIG_SYS_PROMPT_HUSH_PS2 "> "
89#endif
wdenkfe8c2802002-11-03 00:38:21 +000090#endif
wdenkfe8c2802002-11-03 00:38:21 +000091#ifndef __U_BOOT__
92#include <ctype.h> /* isalpha, isdigit */
93#include <unistd.h> /* getpid */
94#include <stdlib.h> /* getenv, atoi */
95#include <string.h> /* strchr */
96#include <stdio.h> /* popen etc. */
97#include <glob.h> /* glob, of course */
98#include <stdarg.h> /* va_list */
99#include <errno.h>
100#include <fcntl.h>
101#include <getopt.h> /* should be pretty obvious */
102
103#include <sys/stat.h> /* ulimit */
104#include <sys/types.h>
105#include <sys/wait.h>
106#include <signal.h>
107
108/* #include <dmalloc.h> */
wdenkfe8c2802002-11-03 00:38:21 +0000109
wdenkd0fb80c2003-01-11 09:48:40 +0000110#if 1
wdenkfe8c2802002-11-03 00:38:21 +0000111#include "busybox.h"
112#include "cmdedit.h"
113#else
114#define applet_name "hush"
115#include "standalone.h"
116#define hush_main main
wdenkd0fb80c2003-01-11 09:48:40 +0000117#undef CONFIG_FEATURE_SH_FANCY_PROMPT
118#define BB_BANNER
wdenkfe8c2802002-11-03 00:38:21 +0000119#endif
120#endif
121#define SPECIAL_VAR_SYMBOL 03
Joe Hershbergera005f192012-08-17 10:26:30 +0000122#define SUBSTED_VAR_SYMBOL 04
wdenkfe8c2802002-11-03 00:38:21 +0000123#ifndef __U_BOOT__
124#define FLAG_EXIT_FROM_LOOP 1
125#define FLAG_PARSE_SEMICOLON (1 << 1) /* symbol ';' is special for parser */
126#define FLAG_REPARSING (1 << 2) /* >= 2nd pass */
127
128#endif
129
130#ifdef __U_BOOT__
Wolfgang Denkd87080b2006-03-31 18:32:53 +0200131DECLARE_GLOBAL_DATA_PTR;
132
wdenkfe8c2802002-11-03 00:38:21 +0000133#define EXIT_SUCCESS 0
134#define EOF -1
135#define syntax() syntax_err()
136#define xstrdup strdup
137#define error_msg printf
138#else
139typedef enum {
140 REDIRECT_INPUT = 1,
141 REDIRECT_OVERWRITE = 2,
142 REDIRECT_APPEND = 3,
143 REDIRECT_HEREIS = 4,
144 REDIRECT_IO = 5
145} redir_type;
146
147/* The descrip member of this structure is only used to make debugging
148 * output pretty */
149struct {int mode; int default_fd; char *descrip;} redir_table[] = {
150 { 0, 0, "()" },
151 { O_RDONLY, 0, "<" },
152 { O_CREAT|O_TRUNC|O_WRONLY, 1, ">" },
153 { O_CREAT|O_APPEND|O_WRONLY, 1, ">>" },
154 { O_RDONLY, -1, "<<" },
155 { O_RDWR, 1, "<>" }
156};
157#endif
158
159typedef enum {
160 PIPE_SEQ = 1,
161 PIPE_AND = 2,
162 PIPE_OR = 3,
163 PIPE_BG = 4,
164} pipe_style;
165
166/* might eventually control execution */
167typedef enum {
168 RES_NONE = 0,
169 RES_IF = 1,
170 RES_THEN = 2,
171 RES_ELIF = 3,
172 RES_ELSE = 4,
173 RES_FI = 5,
174 RES_FOR = 6,
175 RES_WHILE = 7,
176 RES_UNTIL = 8,
177 RES_DO = 9,
178 RES_DONE = 10,
179 RES_XXXX = 11,
180 RES_IN = 12,
181 RES_SNTX = 13
182} reserved_style;
183#define FLAG_END (1<<RES_NONE)
184#define FLAG_IF (1<<RES_IF)
185#define FLAG_THEN (1<<RES_THEN)
186#define FLAG_ELIF (1<<RES_ELIF)
187#define FLAG_ELSE (1<<RES_ELSE)
188#define FLAG_FI (1<<RES_FI)
189#define FLAG_FOR (1<<RES_FOR)
190#define FLAG_WHILE (1<<RES_WHILE)
191#define FLAG_UNTIL (1<<RES_UNTIL)
192#define FLAG_DO (1<<RES_DO)
193#define FLAG_DONE (1<<RES_DONE)
194#define FLAG_IN (1<<RES_IN)
195#define FLAG_START (1<<RES_XXXX)
196
197/* This holds pointers to the various results of parsing */
198struct p_context {
199 struct child_prog *child;
200 struct pipe *list_head;
201 struct pipe *pipe;
202#ifndef __U_BOOT__
203 struct redir_struct *pending_redirect;
204#endif
205 reserved_style w;
206 int old_flag; /* for figuring out valid reserved words */
207 struct p_context *stack;
208 int type; /* define type of parser : ";$" common or special symbol */
209 /* How about quoting status? */
210};
211
212#ifndef __U_BOOT__
213struct redir_struct {
214 redir_type type; /* type of redirection */
215 int fd; /* file descriptor being redirected */
216 int dup; /* -1, or file descriptor being duplicated */
217 struct redir_struct *next; /* pointer to the next redirect in the list */
218 glob_t word; /* *word.gl_pathv is the filename */
219};
220#endif
221
222struct child_prog {
223#ifndef __U_BOOT__
224 pid_t pid; /* 0 if exited */
225#endif
226 char **argv; /* program name and arguments */
Stephen Warrenfe9ca3d2014-03-01 22:16:10 -0700227 /* was quoted when parsed; copy of struct o_string.nonnull field */
Simon Glasseca86fa2014-04-10 20:01:24 -0600228 int *argv_nonnull;
wdenkfe8c2802002-11-03 00:38:21 +0000229#ifdef __U_BOOT__
230 int argc; /* number of program arguments */
231#endif
232 struct pipe *group; /* if non-NULL, first in group or subshell */
233#ifndef __U_BOOT__
234 int subshell; /* flag, non-zero if group must be forked */
235 struct redir_struct *redirects; /* I/O redirections */
236 glob_t glob_result; /* result of parameter globbing */
237 int is_stopped; /* is the program currently running? */
238 struct pipe *family; /* pointer back to the child's parent pipe */
239#endif
240 int sp; /* number of SPECIAL_VAR_SYMBOL */
241 int type;
242};
243
244struct pipe {
245#ifndef __U_BOOT__
246 int jobid; /* job number */
247#endif
248 int num_progs; /* total number of programs in job */
249#ifndef __U_BOOT__
250 int running_progs; /* number of programs running */
251 char *text; /* name of job */
252 char *cmdbuf; /* buffer various argv's point into */
253 pid_t pgrp; /* process group ID for the job */
254#endif
255 struct child_prog *progs; /* array of commands in pipe */
256 struct pipe *next; /* to track background commands */
257#ifndef __U_BOOT__
258 int stopped_progs; /* number of programs alive, but stopped */
259 int job_context; /* bitmask defining current context */
260#endif
261 pipe_style followup; /* PIPE_BG, PIPE_SEQ, PIPE_OR, PIPE_AND */
262 reserved_style r_mode; /* supports if, for, while, until */
263};
264
265#ifndef __U_BOOT__
266struct close_me {
267 int fd;
268 struct close_me *next;
269};
270#endif
271
272struct variables {
273 char *name;
274 char *value;
275 int flg_export;
276 int flg_read_only;
277 struct variables *next;
278};
279
280/* globals, connect us to the outside world
281 * the first three support $?, $#, and $1 */
282#ifndef __U_BOOT__
283char **global_argv;
284unsigned int global_argc;
285#endif
Kim Phillips199adb62012-10-29 13:34:32 +0000286static unsigned int last_return_code;
wdenkfe8c2802002-11-03 00:38:21 +0000287#ifndef __U_BOOT__
288extern char **environ; /* This is in <unistd.h>, but protected with __USE_GNU */
289#endif
290
291/* "globals" within this file */
Wolfgang Denk77ddac92005-10-13 16:45:02 +0200292static uchar *ifs;
wdenkfe8c2802002-11-03 00:38:21 +0000293static char map[256];
294#ifndef __U_BOOT__
295static int fake_mode;
296static int interactive;
297static struct close_me *close_me_head;
298static const char *cwd;
299static struct pipe *job_list;
300static unsigned int last_bg_pid;
301static unsigned int last_jobid;
302static unsigned int shell_terminal;
303static char *PS1;
304static char *PS2;
305struct variables shell_ver = { "HUSH_VERSION", "0.01", 1, 1, 0 };
306struct variables *top_vars = &shell_ver;
307#else
308static int flag_repeat = 0;
309static int do_repeat = 0;
wdenk2d5b5612003-10-14 19:43:55 +0000310static struct variables *top_vars = NULL ;
wdenkfe8c2802002-11-03 00:38:21 +0000311#endif /*__U_BOOT__ */
312
313#define B_CHUNK (100)
314#define B_NOSPAC 1
315
316typedef struct {
317 char *data;
318 int length;
319 int maxlen;
320 int quote;
321 int nonnull;
322} o_string;
323#define NULL_O_STRING {NULL,0,0,0,0}
324/* used for initialization:
325 o_string foo = NULL_O_STRING; */
326
327/* I can almost use ordinary FILE *. Is open_memstream() universally
328 * available? Where is it documented? */
329struct in_str {
330 const char *p;
331#ifndef __U_BOOT__
332 char peek_buf[2];
333#endif
334 int __promptme;
335 int promptmode;
336#ifndef __U_BOOT__
337 FILE *file;
338#endif
339 int (*get) (struct in_str *);
340 int (*peek) (struct in_str *);
341};
342#define b_getch(input) ((input)->get(input))
343#define b_peek(input) ((input)->peek(input))
344
345#ifndef __U_BOOT__
346#define JOB_STATUS_FORMAT "[%d] %-22s %.40s\n"
347
348struct built_in_command {
349 char *cmd; /* name */
350 char *descr; /* description */
351 int (*function) (struct child_prog *); /* function ptr */
352};
353#endif
354
Stefan Roese4cacf7c2008-08-19 14:57:55 +0200355/* define DEBUG_SHELL for debugging output (obviously ;-)) */
356#if 0
357#define DEBUG_SHELL
358#endif
359
wdenkfe8c2802002-11-03 00:38:21 +0000360/* This should be in utility.c */
361#ifdef DEBUG_SHELL
362#ifndef __U_BOOT__
363static void debug_printf(const char *format, ...)
364{
365 va_list args;
366 va_start(args, format);
367 vfprintf(stderr, format, args);
368 va_end(args);
369}
370#else
Stefan Roese4cacf7c2008-08-19 14:57:55 +0200371#define debug_printf(fmt,args...) printf (fmt ,##args)
wdenkfe8c2802002-11-03 00:38:21 +0000372#endif
373#else
374static inline void debug_printf(const char *format, ...) { }
375#endif
376#define final_printf debug_printf
377
378#ifdef __U_BOOT__
379static void syntax_err(void) {
380 printf("syntax error\n");
381}
382#else
383static void __syntax(char *file, int line) {
384 error_msg("syntax error %s:%d", file, line);
385}
386#define syntax() __syntax(__FILE__, __LINE__)
387#endif
388
389#ifdef __U_BOOT__
390static void *xmalloc(size_t size);
391static void *xrealloc(void *ptr, size_t size);
392#else
393/* Index of subroutines: */
394/* function prototypes for builtins */
395static int builtin_cd(struct child_prog *child);
396static int builtin_env(struct child_prog *child);
397static int builtin_eval(struct child_prog *child);
398static int builtin_exec(struct child_prog *child);
399static int builtin_exit(struct child_prog *child);
400static int builtin_export(struct child_prog *child);
401static int builtin_fg_bg(struct child_prog *child);
402static int builtin_help(struct child_prog *child);
403static int builtin_jobs(struct child_prog *child);
404static int builtin_pwd(struct child_prog *child);
405static int builtin_read(struct child_prog *child);
406static int builtin_set(struct child_prog *child);
407static int builtin_shift(struct child_prog *child);
408static int builtin_source(struct child_prog *child);
409static int builtin_umask(struct child_prog *child);
410static int builtin_unset(struct child_prog *child);
411static int builtin_not_written(struct child_prog *child);
412#endif
413/* o_string manipulation: */
414static int b_check_space(o_string *o, int len);
415static int b_addchr(o_string *o, int ch);
416static void b_reset(o_string *o);
417static int b_addqchr(o_string *o, int ch, int quote);
wdenkc26e4542004-04-18 10:13:26 +0000418#ifndef __U_BOOT__
wdenkfe8c2802002-11-03 00:38:21 +0000419static int b_adduint(o_string *o, unsigned int i);
wdenkc26e4542004-04-18 10:13:26 +0000420#endif
wdenkfe8c2802002-11-03 00:38:21 +0000421/* in_str manipulations: */
422static int static_get(struct in_str *i);
423static int static_peek(struct in_str *i);
424static int file_get(struct in_str *i);
425static int file_peek(struct in_str *i);
426#ifndef __U_BOOT__
427static void setup_file_in_str(struct in_str *i, FILE *f);
428#else
429static void setup_file_in_str(struct in_str *i);
430#endif
431static void setup_string_in_str(struct in_str *i, const char *s);
432#ifndef __U_BOOT__
433/* close_me manipulations: */
434static void mark_open(int fd);
435static void mark_closed(int fd);
wdenkd0fb80c2003-01-11 09:48:40 +0000436static void close_all(void);
wdenkfe8c2802002-11-03 00:38:21 +0000437#endif
438/* "run" the final data structures: */
439static char *indenter(int i);
440static int free_pipe_list(struct pipe *head, int indent);
441static int free_pipe(struct pipe *pi, int indent);
442/* really run the final data structures: */
443#ifndef __U_BOOT__
444static int setup_redirects(struct child_prog *prog, int squirrel[]);
445#endif
446static int run_list_real(struct pipe *pi);
447#ifndef __U_BOOT__
448static void pseudo_exec(struct child_prog *child) __attribute__ ((noreturn));
449#endif
450static int run_pipe_real(struct pipe *pi);
451/* extended glob support: */
452#ifndef __U_BOOT__
453static int globhack(const char *src, int flags, glob_t *pglob);
454static int glob_needed(const char *s);
455static int xglob(o_string *dest, int flags, glob_t *pglob);
456#endif
457/* variable assignment: */
458static int is_assignment(const char *s);
459/* data structure manipulation: */
460#ifndef __U_BOOT__
461static int setup_redirect(struct p_context *ctx, int fd, redir_type style, struct in_str *input);
462#endif
463static void initialize_context(struct p_context *ctx);
464static int done_word(o_string *dest, struct p_context *ctx);
465static int done_command(struct p_context *ctx);
466static int done_pipe(struct p_context *ctx, pipe_style type);
467/* primary string parsing: */
468#ifndef __U_BOOT__
469static int redirect_dup_num(struct in_str *input);
470static int redirect_opt_num(o_string *o);
471static int process_command_subs(o_string *dest, struct p_context *ctx, struct in_str *input, int subst_end);
472static int parse_group(o_string *dest, struct p_context *ctx, struct in_str *input, int ch);
473#endif
474static char *lookup_param(char *src);
Stephen Warrenfe9ca3d2014-03-01 22:16:10 -0700475static char *make_string(char **inp, int *nonnull);
wdenkfe8c2802002-11-03 00:38:21 +0000476static int handle_dollar(o_string *dest, struct p_context *ctx, struct in_str *input);
477#ifndef __U_BOOT__
478static int parse_string(o_string *dest, struct p_context *ctx, const char *src);
479#endif
480static int parse_stream(o_string *dest, struct p_context *ctx, struct in_str *input0, int end_trigger);
481/* setup: */
482static int parse_stream_outer(struct in_str *inp, int flag);
483#ifndef __U_BOOT__
484static int parse_string_outer(const char *s, int flag);
485static int parse_file_outer(FILE *f);
486#endif
487#ifndef __U_BOOT__
488/* job management: */
489static int checkjobs(struct pipe* fg_pipe);
490static void insert_bg_job(struct pipe *pi);
491static void remove_bg_job(struct pipe *pi);
492#endif
493/* local variable support */
494static char **make_list_in(char **inp, char *name);
495static char *insert_var_value(char *inp);
Joe Hershbergera005f192012-08-17 10:26:30 +0000496static char *insert_var_value_sub(char *inp, int tag_subst);
wdenkfe8c2802002-11-03 00:38:21 +0000497
498#ifndef __U_BOOT__
499/* Table of built-in functions. They can be forked or not, depending on
500 * context: within pipes, they fork. As simple commands, they do not.
501 * When used in non-forking context, they can change global variables
502 * in the parent shell process. If forked, of course they can not.
503 * For example, 'unset foo | whatever' will parse and run, but foo will
504 * still be set at the end. */
505static struct built_in_command bltins[] = {
506 {"bg", "Resume a job in the background", builtin_fg_bg},
507 {"break", "Exit for, while or until loop", builtin_not_written},
508 {"cd", "Change working directory", builtin_cd},
509 {"continue", "Continue for, while or until loop", builtin_not_written},
510 {"env", "Print all environment variables", builtin_env},
511 {"eval", "Construct and run shell command", builtin_eval},
512 {"exec", "Exec command, replacing this shell with the exec'd process",
513 builtin_exec},
514 {"exit", "Exit from shell()", builtin_exit},
515 {"export", "Set environment variable", builtin_export},
516 {"fg", "Bring job into the foreground", builtin_fg_bg},
517 {"jobs", "Lists the active jobs", builtin_jobs},
518 {"pwd", "Print current directory", builtin_pwd},
519 {"read", "Input environment variable", builtin_read},
520 {"return", "Return from a function", builtin_not_written},
521 {"set", "Set/unset shell local variables", builtin_set},
522 {"shift", "Shift positional parameters", builtin_shift},
523 {"trap", "Trap signals", builtin_not_written},
524 {"ulimit","Controls resource limits", builtin_not_written},
525 {"umask","Sets file creation mask", builtin_umask},
526 {"unset", "Unset environment variable", builtin_unset},
527 {".", "Source-in and run commands in a file", builtin_source},
528 {"help", "List shell built-in commands", builtin_help},
529 {NULL, NULL, NULL}
530};
531
532static const char *set_cwd(void)
533{
534 if(cwd==unknown)
535 cwd = NULL; /* xgetcwd(arg) called free(arg) */
536 cwd = xgetcwd((char *)cwd);
537 if (!cwd)
538 cwd = unknown;
539 return cwd;
540}
541
542/* built-in 'eval' handler */
543static int builtin_eval(struct child_prog *child)
544{
545 char *str = NULL;
546 int rcode = EXIT_SUCCESS;
547
548 if (child->argv[1]) {
549 str = make_string(child->argv + 1);
550 parse_string_outer(str, FLAG_EXIT_FROM_LOOP |
551 FLAG_PARSE_SEMICOLON);
552 free(str);
553 rcode = last_return_code;
554 }
555 return rcode;
556}
557
558/* built-in 'cd <path>' handler */
559static int builtin_cd(struct child_prog *child)
560{
561 char *newdir;
562 if (child->argv[1] == NULL)
563 newdir = getenv("HOME");
564 else
565 newdir = child->argv[1];
566 if (chdir(newdir)) {
567 printf("cd: %s: %s\n", newdir, strerror(errno));
568 return EXIT_FAILURE;
569 }
570 set_cwd();
571 return EXIT_SUCCESS;
572}
573
574/* built-in 'env' handler */
575static int builtin_env(struct child_prog *dummy)
576{
577 char **e = environ;
578 if (e == NULL) return EXIT_FAILURE;
579 for (; *e; e++) {
580 puts(*e);
581 }
582 return EXIT_SUCCESS;
583}
584
585/* built-in 'exec' handler */
586static int builtin_exec(struct child_prog *child)
587{
588 if (child->argv[1] == NULL)
589 return EXIT_SUCCESS; /* Really? */
590 child->argv++;
591 pseudo_exec(child);
592 /* never returns */
593}
594
595/* built-in 'exit' handler */
596static int builtin_exit(struct child_prog *child)
597{
598 if (child->argv[1] == NULL)
599 exit(last_return_code);
600 exit (atoi(child->argv[1]));
601}
602
603/* built-in 'export VAR=value' handler */
604static int builtin_export(struct child_prog *child)
605{
606 int res = 0;
607 char *name = child->argv[1];
608
609 if (name == NULL) {
610 return (builtin_env(child));
611 }
612
613 name = strdup(name);
614
615 if(name) {
616 char *value = strchr(name, '=');
617
618 if (!value) {
619 char *tmp;
620 /* They are exporting something without an =VALUE */
621
622 value = get_local_var(name);
623 if (value) {
624 size_t ln = strlen(name);
625
626 tmp = realloc(name, ln+strlen(value)+2);
627 if(tmp==NULL)
628 res = -1;
629 else {
630 sprintf(tmp+ln, "=%s", value);
631 name = tmp;
632 }
633 } else {
634 /* bash does not return an error when trying to export
635 * an undefined variable. Do likewise. */
636 res = 1;
637 }
638 }
639 }
640 if (res<0)
641 perror_msg("export");
642 else if(res==0)
643 res = set_local_var(name, 1);
644 else
645 res = 0;
646 free(name);
647 return res;
648}
649
650/* built-in 'fg' and 'bg' handler */
651static int builtin_fg_bg(struct child_prog *child)
652{
653 int i, jobnum;
654 struct pipe *pi=NULL;
655
656 if (!interactive)
657 return EXIT_FAILURE;
658 /* If they gave us no args, assume they want the last backgrounded task */
659 if (!child->argv[1]) {
660 for (pi = job_list; pi; pi = pi->next) {
661 if (pi->jobid == last_jobid) {
662 break;
663 }
664 }
665 if (!pi) {
666 error_msg("%s: no current job", child->argv[0]);
667 return EXIT_FAILURE;
668 }
669 } else {
670 if (sscanf(child->argv[1], "%%%d", &jobnum) != 1) {
671 error_msg("%s: bad argument '%s'", child->argv[0], child->argv[1]);
672 return EXIT_FAILURE;
673 }
674 for (pi = job_list; pi; pi = pi->next) {
675 if (pi->jobid == jobnum) {
676 break;
677 }
678 }
679 if (!pi) {
680 error_msg("%s: %d: no such job", child->argv[0], jobnum);
681 return EXIT_FAILURE;
682 }
683 }
684
685 if (*child->argv[0] == 'f') {
686 /* Put the job into the foreground. */
687 tcsetpgrp(shell_terminal, pi->pgrp);
688 }
689
690 /* Restart the processes in the job */
691 for (i = 0; i < pi->num_progs; i++)
692 pi->progs[i].is_stopped = 0;
693
694 if ( (i=kill(- pi->pgrp, SIGCONT)) < 0) {
695 if (i == ESRCH) {
696 remove_bg_job(pi);
697 } else {
698 perror_msg("kill (SIGCONT)");
699 }
700 }
701
702 pi->stopped_progs = 0;
703 return EXIT_SUCCESS;
704}
705
706/* built-in 'help' handler */
707static int builtin_help(struct child_prog *dummy)
708{
709 struct built_in_command *x;
710
711 printf("\nBuilt-in commands:\n");
712 printf("-------------------\n");
713 for (x = bltins; x->cmd; x++) {
714 if (x->descr==NULL)
715 continue;
716 printf("%s\t%s\n", x->cmd, x->descr);
717 }
718 printf("\n\n");
719 return EXIT_SUCCESS;
720}
721
722/* built-in 'jobs' handler */
723static int builtin_jobs(struct child_prog *child)
724{
725 struct pipe *job;
726 char *status_string;
727
728 for (job = job_list; job; job = job->next) {
729 if (job->running_progs == job->stopped_progs)
730 status_string = "Stopped";
731 else
732 status_string = "Running";
733
734 printf(JOB_STATUS_FORMAT, job->jobid, status_string, job->text);
735 }
736 return EXIT_SUCCESS;
737}
738
739
740/* built-in 'pwd' handler */
741static int builtin_pwd(struct child_prog *dummy)
742{
743 puts(set_cwd());
744 return EXIT_SUCCESS;
745}
746
747/* built-in 'read VAR' handler */
748static int builtin_read(struct child_prog *child)
749{
750 int res;
751
752 if (child->argv[1]) {
753 char string[BUFSIZ];
754 char *var = 0;
755
756 string[0] = 0; /* In case stdin has only EOF */
757 /* read string */
758 fgets(string, sizeof(string), stdin);
759 chomp(string);
760 var = malloc(strlen(child->argv[1])+strlen(string)+2);
761 if(var) {
762 sprintf(var, "%s=%s", child->argv[1], string);
763 res = set_local_var(var, 0);
764 } else
765 res = -1;
766 if (res)
767 fprintf(stderr, "read: %m\n");
768 free(var); /* So not move up to avoid breaking errno */
769 return res;
770 } else {
771 do res=getchar(); while(res!='\n' && res!=EOF);
772 return 0;
773 }
774}
775
776/* built-in 'set VAR=value' handler */
777static int builtin_set(struct child_prog *child)
778{
779 char *temp = child->argv[1];
780 struct variables *e;
781
782 if (temp == NULL)
783 for(e = top_vars; e; e=e->next)
784 printf("%s=%s\n", e->name, e->value);
785 else
786 set_local_var(temp, 0);
787
788 return EXIT_SUCCESS;
789}
790
791
792/* Built-in 'shift' handler */
793static int builtin_shift(struct child_prog *child)
794{
795 int n=1;
796 if (child->argv[1]) {
797 n=atoi(child->argv[1]);
798 }
799 if (n>=0 && n<global_argc) {
800 /* XXX This probably breaks $0 */
801 global_argc -= n;
802 global_argv += n;
803 return EXIT_SUCCESS;
804 } else {
805 return EXIT_FAILURE;
806 }
807}
808
809/* Built-in '.' handler (read-in and execute commands from file) */
810static int builtin_source(struct child_prog *child)
811{
812 FILE *input;
813 int status;
814
815 if (child->argv[1] == NULL)
816 return EXIT_FAILURE;
817
818 /* XXX search through $PATH is missing */
819 input = fopen(child->argv[1], "r");
820 if (!input) {
821 error_msg("Couldn't open file '%s'", child->argv[1]);
822 return EXIT_FAILURE;
823 }
824
825 /* Now run the file */
826 /* XXX argv and argc are broken; need to save old global_argv
827 * (pointer only is OK!) on this stack frame,
828 * set global_argv=child->argv+1, recurse, and restore. */
829 mark_open(fileno(input));
830 status = parse_file_outer(input);
831 mark_closed(fileno(input));
832 fclose(input);
833 return (status);
834}
835
836static int builtin_umask(struct child_prog *child)
837{
838 mode_t new_umask;
839 const char *arg = child->argv[1];
840 char *end;
841 if (arg) {
842 new_umask=strtoul(arg, &end, 8);
843 if (*end!='\0' || end == arg) {
844 return EXIT_FAILURE;
845 }
846 } else {
847 printf("%.3o\n", (unsigned int) (new_umask=umask(0)));
848 }
849 umask(new_umask);
850 return EXIT_SUCCESS;
851}
852
853/* built-in 'unset VAR' handler */
854static int builtin_unset(struct child_prog *child)
855{
856 /* bash returned already true */
857 unset_local_var(child->argv[1]);
858 return EXIT_SUCCESS;
859}
860
861static int builtin_not_written(struct child_prog *child)
862{
863 printf("builtin_%s not written\n",child->argv[0]);
864 return EXIT_FAILURE;
865}
866#endif
867
868static int b_check_space(o_string *o, int len)
869{
870 /* It would be easy to drop a more restrictive policy
871 * in here, such as setting a maximum string length */
872 if (o->length + len > o->maxlen) {
873 char *old_data = o->data;
874 /* assert (data == NULL || o->maxlen != 0); */
875 o->maxlen += max(2*len, B_CHUNK);
876 o->data = realloc(o->data, 1 + o->maxlen);
877 if (o->data == NULL) {
878 free(old_data);
879 }
880 }
881 return o->data == NULL;
882}
883
884static int b_addchr(o_string *o, int ch)
885{
886 debug_printf("b_addchr: %c %d %p\n", ch, o->length, o);
887 if (b_check_space(o, 1)) return B_NOSPAC;
888 o->data[o->length] = ch;
889 o->length++;
890 o->data[o->length] = '\0';
891 return 0;
892}
893
894static void b_reset(o_string *o)
895{
896 o->length = 0;
897 o->nonnull = 0;
898 if (o->data != NULL) *o->data = '\0';
899}
900
901static void b_free(o_string *o)
902{
903 b_reset(o);
wdenkd0fb80c2003-01-11 09:48:40 +0000904 free(o->data);
wdenkfe8c2802002-11-03 00:38:21 +0000905 o->data = NULL;
906 o->maxlen = 0;
907}
908
909/* My analysis of quoting semantics tells me that state information
910 * is associated with a destination, not a source.
911 */
912static int b_addqchr(o_string *o, int ch, int quote)
913{
914 if (quote && strchr("*?[\\",ch)) {
915 int rc;
916 rc = b_addchr(o, '\\');
917 if (rc) return rc;
918 }
919 return b_addchr(o, ch);
920}
921
wdenkc26e4542004-04-18 10:13:26 +0000922#ifndef __U_BOOT__
wdenkfe8c2802002-11-03 00:38:21 +0000923static int b_adduint(o_string *o, unsigned int i)
924{
925 int r;
926 char *p = simple_itoa(i);
927 /* no escape checking necessary */
928 do r=b_addchr(o, *p++); while (r==0 && *p);
929 return r;
930}
wdenkc26e4542004-04-18 10:13:26 +0000931#endif
wdenkfe8c2802002-11-03 00:38:21 +0000932
933static int static_get(struct in_str *i)
934{
Wolfgang Denkd0ff51b2008-07-14 15:19:07 +0200935 int ch = *i->p++;
wdenkfe8c2802002-11-03 00:38:21 +0000936 if (ch=='\0') return EOF;
937 return ch;
938}
939
940static int static_peek(struct in_str *i)
941{
942 return *i->p;
943}
944
945#ifndef __U_BOOT__
946static inline void cmdedit_set_initial_prompt(void)
947{
wdenkd0fb80c2003-01-11 09:48:40 +0000948#ifndef CONFIG_FEATURE_SH_FANCY_PROMPT
wdenkfe8c2802002-11-03 00:38:21 +0000949 PS1 = NULL;
950#else
951 PS1 = getenv("PS1");
952 if(PS1==0)
953 PS1 = "\\w \\$ ";
954#endif
955}
956
957static inline void setup_prompt_string(int promptmode, char **prompt_str)
958{
959 debug_printf("setup_prompt_string %d ",promptmode);
wdenkd0fb80c2003-01-11 09:48:40 +0000960#ifndef CONFIG_FEATURE_SH_FANCY_PROMPT
wdenkfe8c2802002-11-03 00:38:21 +0000961 /* Set up the prompt */
962 if (promptmode == 1) {
wdenkd0fb80c2003-01-11 09:48:40 +0000963 free(PS1);
wdenkfe8c2802002-11-03 00:38:21 +0000964 PS1=xmalloc(strlen(cwd)+4);
965 sprintf(PS1, "%s %s", cwd, ( geteuid() != 0 ) ? "$ ":"# ");
966 *prompt_str = PS1;
967 } else {
968 *prompt_str = PS2;
969 }
970#else
971 *prompt_str = (promptmode==1)? PS1 : PS2;
972#endif
973 debug_printf("result %s\n",*prompt_str);
974}
975#endif
976
Marek Vasut13d30462016-01-27 04:47:54 +0100977#ifdef __U_BOOT__
978static int uboot_cli_readline(struct in_str *i)
979{
980 char *prompt;
Marek Vasutf3b267b2016-01-27 04:47:55 +0100981 char __maybe_unused *ps_prompt = NULL;
Marek Vasut13d30462016-01-27 04:47:54 +0100982
983 if (i->promptmode == 1)
984 prompt = CONFIG_SYS_PROMPT;
985 else
986 prompt = CONFIG_SYS_PROMPT_HUSH_PS2;
987
Marek Vasutf3b267b2016-01-27 04:47:55 +0100988#ifdef CONFIG_CMDLINE_PS_SUPPORT
989 if (i->promptmode == 1)
990 ps_prompt = getenv("PS1");
991 else
992 ps_prompt = getenv("PS2");
993 if (ps_prompt)
994 prompt = ps_prompt;
995#endif
996
Marek Vasut13d30462016-01-27 04:47:54 +0100997 return cli_readline(prompt);
998}
999#endif
1000
wdenkfe8c2802002-11-03 00:38:21 +00001001static void get_user_input(struct in_str *i)
1002{
1003#ifndef __U_BOOT__
1004 char *prompt_str;
1005 static char the_command[BUFSIZ];
1006
1007 setup_prompt_string(i->promptmode, &prompt_str);
wdenkd0fb80c2003-01-11 09:48:40 +00001008#ifdef CONFIG_FEATURE_COMMAND_EDITING
wdenkfe8c2802002-11-03 00:38:21 +00001009 /*
1010 ** enable command line editing only while a command line
1011 ** is actually being read; otherwise, we'll end up bequeathing
1012 ** atexit() handlers and other unwanted stuff to our
1013 ** child processes (rob@sysgo.de)
1014 */
1015 cmdedit_read_input(prompt_str, the_command);
1016#else
1017 fputs(prompt_str, stdout);
1018 fflush(stdout);
1019 the_command[0]=fgetc(i->file);
1020 the_command[1]='\0';
1021#endif
1022 fflush(stdout);
1023 i->p = the_command;
1024#else
wdenkfe8c2802002-11-03 00:38:21 +00001025 int n;
Kristian Otnes5c50a922014-04-25 15:35:43 +02001026 static char the_command[CONFIG_SYS_CBSIZE + 1];
wdenkfe8c2802002-11-03 00:38:21 +00001027
Simon Glassb26440f2014-04-10 20:01:31 -06001028 bootretry_reset_cmd_timeout();
wdenkfe8c2802002-11-03 00:38:21 +00001029 i->__promptme = 1;
Marek Vasut13d30462016-01-27 04:47:54 +01001030 n = uboot_cli_readline(i);
1031
Wolfgang Denk396387a2005-08-12 23:34:51 +02001032#ifdef CONFIG_BOOT_RETRY_TIME
1033 if (n == -2) {
1034 puts("\nTimeout waiting for command\n");
1035# ifdef CONFIG_RESET_TO_RETRY
1036 do_reset(NULL, 0, 0, NULL);
1037# else
1038# error "This currently only works with CONFIG_RESET_TO_RETRY enabled"
1039# endif
1040 }
1041#endif
wdenkfe8c2802002-11-03 00:38:21 +00001042 if (n == -1 ) {
1043 flag_repeat = 0;
1044 i->__promptme = 0;
1045 }
1046 n = strlen(console_buffer);
1047 console_buffer[n] = '\n';
1048 console_buffer[n+1]= '\0';
1049 if (had_ctrlc()) flag_repeat = 0;
1050 clear_ctrlc();
1051 do_repeat = 0;
1052 if (i->promptmode == 1) {
1053 if (console_buffer[0] == '\n'&& flag_repeat == 0) {
1054 strcpy(the_command,console_buffer);
1055 }
1056 else {
1057 if (console_buffer[0] != '\n') {
1058 strcpy(the_command,console_buffer);
1059 flag_repeat = 1;
1060 }
1061 else {
1062 do_repeat = 1;
1063 }
1064 }
1065 i->p = the_command;
1066 }
1067 else {
wdenk8bde7f72003-06-27 21:31:46 +00001068 if (console_buffer[0] != '\n') {
1069 if (strlen(the_command) + strlen(console_buffer)
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02001070 < CONFIG_SYS_CBSIZE) {
wdenk8bde7f72003-06-27 21:31:46 +00001071 n = strlen(the_command);
1072 the_command[n-1] = ' ';
1073 strcpy(&the_command[n],console_buffer);
wdenkfe8c2802002-11-03 00:38:21 +00001074 }
1075 else {
1076 the_command[0] = '\n';
1077 the_command[1] = '\0';
1078 flag_repeat = 0;
1079 }
1080 }
1081 if (i->__promptme == 0) {
1082 the_command[0] = '\n';
1083 the_command[1] = '\0';
1084 }
1085 i->p = console_buffer;
1086 }
1087#endif
1088}
1089
1090/* This is the magic location that prints prompts
1091 * and gets data back from the user */
1092static int file_get(struct in_str *i)
1093{
1094 int ch;
1095
1096 ch = 0;
1097 /* If there is data waiting, eat it up */
1098 if (i->p && *i->p) {
Wolfgang Denkd0ff51b2008-07-14 15:19:07 +02001099 ch = *i->p++;
wdenkfe8c2802002-11-03 00:38:21 +00001100 } else {
1101 /* need to double check i->file because we might be doing something
1102 * more complicated by now, like sourcing or substituting. */
1103#ifndef __U_BOOT__
1104 if (i->__promptme && interactive && i->file == stdin) {
1105 while(! i->p || (interactive && strlen(i->p)==0) ) {
1106#else
1107 while(! i->p || strlen(i->p)==0 ) {
1108#endif
1109 get_user_input(i);
1110 }
1111 i->promptmode=2;
1112#ifndef __U_BOOT__
1113 i->__promptme = 0;
1114#endif
1115 if (i->p && *i->p) {
Wolfgang Denkd0ff51b2008-07-14 15:19:07 +02001116 ch = *i->p++;
wdenkfe8c2802002-11-03 00:38:21 +00001117 }
1118#ifndef __U_BOOT__
1119 } else {
1120 ch = fgetc(i->file);
1121 }
1122
1123#endif
1124 debug_printf("b_getch: got a %d\n", ch);
1125 }
1126#ifndef __U_BOOT__
1127 if (ch == '\n') i->__promptme=1;
1128#endif
1129 return ch;
1130}
1131
1132/* All the callers guarantee this routine will never be
1133 * used right after a newline, so prompting is not needed.
1134 */
1135static int file_peek(struct in_str *i)
1136{
1137#ifndef __U_BOOT__
1138 if (i->p && *i->p) {
1139#endif
1140 return *i->p;
1141#ifndef __U_BOOT__
1142 } else {
1143 i->peek_buf[0] = fgetc(i->file);
1144 i->peek_buf[1] = '\0';
1145 i->p = i->peek_buf;
1146 debug_printf("b_peek: got a %d\n", *i->p);
1147 return *i->p;
1148 }
1149#endif
1150}
1151
1152#ifndef __U_BOOT__
1153static void setup_file_in_str(struct in_str *i, FILE *f)
1154#else
1155static void setup_file_in_str(struct in_str *i)
1156#endif
1157{
1158 i->peek = file_peek;
1159 i->get = file_get;
1160 i->__promptme=1;
1161 i->promptmode=1;
1162#ifndef __U_BOOT__
1163 i->file = f;
1164#endif
1165 i->p = NULL;
1166}
1167
1168static void setup_string_in_str(struct in_str *i, const char *s)
1169{
1170 i->peek = static_peek;
1171 i->get = static_get;
1172 i->__promptme=1;
1173 i->promptmode=1;
1174 i->p = s;
1175}
1176
1177#ifndef __U_BOOT__
1178static void mark_open(int fd)
1179{
1180 struct close_me *new = xmalloc(sizeof(struct close_me));
1181 new->fd = fd;
1182 new->next = close_me_head;
1183 close_me_head = new;
1184}
1185
1186static void mark_closed(int fd)
1187{
1188 struct close_me *tmp;
1189 if (close_me_head == NULL || close_me_head->fd != fd)
1190 error_msg_and_die("corrupt close_me");
1191 tmp = close_me_head;
1192 close_me_head = close_me_head->next;
1193 free(tmp);
1194}
1195
wdenkd0fb80c2003-01-11 09:48:40 +00001196static void close_all(void)
wdenkfe8c2802002-11-03 00:38:21 +00001197{
1198 struct close_me *c;
1199 for (c=close_me_head; c; c=c->next) {
1200 close(c->fd);
1201 }
1202 close_me_head = NULL;
1203}
1204
1205/* squirrel != NULL means we squirrel away copies of stdin, stdout,
1206 * and stderr if they are redirected. */
1207static int setup_redirects(struct child_prog *prog, int squirrel[])
1208{
1209 int openfd, mode;
1210 struct redir_struct *redir;
1211
1212 for (redir=prog->redirects; redir; redir=redir->next) {
1213 if (redir->dup == -1 && redir->word.gl_pathv == NULL) {
1214 /* something went wrong in the parse. Pretend it didn't happen */
1215 continue;
1216 }
1217 if (redir->dup == -1) {
1218 mode=redir_table[redir->type].mode;
1219 openfd = open(redir->word.gl_pathv[0], mode, 0666);
1220 if (openfd < 0) {
1221 /* this could get lost if stderr has been redirected, but
1222 bash and ash both lose it as well (though zsh doesn't!) */
1223 perror_msg("error opening %s", redir->word.gl_pathv[0]);
1224 return 1;
1225 }
1226 } else {
1227 openfd = redir->dup;
1228 }
1229
1230 if (openfd != redir->fd) {
1231 if (squirrel && redir->fd < 3) {
1232 squirrel[redir->fd] = dup(redir->fd);
1233 }
1234 if (openfd == -3) {
1235 close(openfd);
1236 } else {
1237 dup2(openfd, redir->fd);
1238 if (redir->dup == -1)
1239 close (openfd);
1240 }
1241 }
1242 }
1243 return 0;
1244}
1245
1246static void restore_redirects(int squirrel[])
1247{
1248 int i, fd;
1249 for (i=0; i<3; i++) {
1250 fd = squirrel[i];
1251 if (fd != -1) {
1252 /* No error checking. I sure wouldn't know what
1253 * to do with an error if I found one! */
1254 dup2(fd, i);
1255 close(fd);
1256 }
1257 }
1258}
1259
1260/* never returns */
1261/* XXX no exit() here. If you don't exec, use _exit instead.
1262 * The at_exit handlers apparently confuse the calling process,
1263 * in particular stdin handling. Not sure why? */
1264static void pseudo_exec(struct child_prog *child)
1265{
1266 int i, rcode;
1267 char *p;
1268 struct built_in_command *x;
1269 if (child->argv) {
1270 for (i=0; is_assignment(child->argv[i]); i++) {
1271 debug_printf("pid %d environment modification: %s\n",getpid(),child->argv[i]);
1272 p = insert_var_value(child->argv[i]);
1273 putenv(strdup(p));
1274 if (p != child->argv[i]) free(p);
1275 }
1276 child->argv+=i; /* XXX this hack isn't so horrible, since we are about
wdenk8bde7f72003-06-27 21:31:46 +00001277 to exit, and therefore don't need to keep data
1278 structures consistent for free() use. */
wdenkfe8c2802002-11-03 00:38:21 +00001279 /* If a variable is assigned in a forest, and nobody listens,
1280 * was it ever really set?
1281 */
1282 if (child->argv[0] == NULL) {
1283 _exit(EXIT_SUCCESS);
1284 }
1285
1286 /*
1287 * Check if the command matches any of the builtins.
1288 * Depending on context, this might be redundant. But it's
1289 * easier to waste a few CPU cycles than it is to figure out
1290 * if this is one of those cases.
1291 */
1292 for (x = bltins; x->cmd; x++) {
1293 if (strcmp(child->argv[0], x->cmd) == 0 ) {
1294 debug_printf("builtin exec %s\n", child->argv[0]);
1295 rcode = x->function(child);
1296 fflush(stdout);
1297 _exit(rcode);
1298 }
1299 }
1300
1301 /* Check if the command matches any busybox internal commands
1302 * ("applets") here.
1303 * FIXME: This feature is not 100% safe, since
1304 * BusyBox is not fully reentrant, so we have no guarantee the things
1305 * from the .bss are still zeroed, or that things from .data are still
1306 * at their defaults. We could exec ourself from /proc/self/exe, but I
1307 * really dislike relying on /proc for things. We could exec ourself
1308 * from global_argv[0], but if we are in a chroot, we may not be able
1309 * to find ourself... */
wdenkd0fb80c2003-01-11 09:48:40 +00001310#ifdef CONFIG_FEATURE_SH_STANDALONE_SHELL
wdenkfe8c2802002-11-03 00:38:21 +00001311 {
1312 int argc_l;
1313 char** argv_l=child->argv;
1314 char *name = child->argv[0];
1315
wdenkd0fb80c2003-01-11 09:48:40 +00001316#ifdef CONFIG_FEATURE_SH_APPLETS_ALWAYS_WIN
wdenkfe8c2802002-11-03 00:38:21 +00001317 /* Following discussions from November 2000 on the busybox mailing
1318 * list, the default configuration, (without
1319 * get_last_path_component()) lets the user force use of an
1320 * external command by specifying the full (with slashes) filename.
wdenkd0fb80c2003-01-11 09:48:40 +00001321 * If you enable CONFIG_FEATURE_SH_APPLETS_ALWAYS_WIN then applets
wdenkfe8c2802002-11-03 00:38:21 +00001322 * _aways_ override external commands, so if you want to run
1323 * /bin/cat, it will use BusyBox cat even if /bin/cat exists on the
1324 * filesystem and is _not_ busybox. Some systems may want this,
1325 * most do not. */
1326 name = get_last_path_component(name);
1327#endif
1328 /* Count argc for use in a second... */
1329 for(argc_l=0;*argv_l!=NULL; argv_l++, argc_l++);
1330 optind = 1;
1331 debug_printf("running applet %s\n", name);
1332 run_applet_by_name(name, argc_l, child->argv);
1333 }
1334#endif
1335 debug_printf("exec of %s\n",child->argv[0]);
1336 execvp(child->argv[0],child->argv);
1337 perror_msg("couldn't exec: %s",child->argv[0]);
1338 _exit(1);
1339 } else if (child->group) {
1340 debug_printf("runtime nesting to group\n");
1341 interactive=0; /* crucial!!!! */
1342 rcode = run_list_real(child->group);
1343 /* OK to leak memory by not calling free_pipe_list,
1344 * since this process is about to exit */
1345 _exit(rcode);
1346 } else {
1347 /* Can happen. See what bash does with ">foo" by itself. */
1348 debug_printf("trying to pseudo_exec null command\n");
1349 _exit(EXIT_SUCCESS);
1350 }
1351}
1352
1353static void insert_bg_job(struct pipe *pi)
1354{
1355 struct pipe *thejob;
1356
1357 /* Linear search for the ID of the job to use */
1358 pi->jobid = 1;
1359 for (thejob = job_list; thejob; thejob = thejob->next)
1360 if (thejob->jobid >= pi->jobid)
1361 pi->jobid = thejob->jobid + 1;
1362
1363 /* add thejob to the list of running jobs */
1364 if (!job_list) {
1365 thejob = job_list = xmalloc(sizeof(*thejob));
1366 } else {
1367 for (thejob = job_list; thejob->next; thejob = thejob->next) /* nothing */;
1368 thejob->next = xmalloc(sizeof(*thejob));
1369 thejob = thejob->next;
1370 }
1371
1372 /* physically copy the struct job */
1373 memcpy(thejob, pi, sizeof(struct pipe));
1374 thejob->next = NULL;
1375 thejob->running_progs = thejob->num_progs;
1376 thejob->stopped_progs = 0;
1377 thejob->text = xmalloc(BUFSIZ); /* cmdedit buffer size */
1378
1379 /*if (pi->progs[0] && pi->progs[0].argv && pi->progs[0].argv[0]) */
1380 {
1381 char *bar=thejob->text;
1382 char **foo=pi->progs[0].argv;
1383 while(foo && *foo) {
1384 bar += sprintf(bar, "%s ", *foo++);
1385 }
1386 }
1387
1388 /* we don't wait for background thejobs to return -- append it
1389 to the list of backgrounded thejobs and leave it alone */
1390 printf("[%d] %d\n", thejob->jobid, thejob->progs[0].pid);
1391 last_bg_pid = thejob->progs[0].pid;
1392 last_jobid = thejob->jobid;
1393}
1394
1395/* remove a backgrounded job */
1396static void remove_bg_job(struct pipe *pi)
1397{
1398 struct pipe *prev_pipe;
1399
1400 if (pi == job_list) {
1401 job_list = pi->next;
1402 } else {
1403 prev_pipe = job_list;
1404 while (prev_pipe->next != pi)
1405 prev_pipe = prev_pipe->next;
1406 prev_pipe->next = pi->next;
1407 }
1408 if (job_list)
1409 last_jobid = job_list->jobid;
1410 else
1411 last_jobid = 0;
1412
1413 pi->stopped_progs = 0;
1414 free_pipe(pi, 0);
1415 free(pi);
1416}
1417
1418/* Checks to see if any processes have exited -- if they
1419 have, figure out why and see if a job has completed */
1420static int checkjobs(struct pipe* fg_pipe)
1421{
1422 int attributes;
1423 int status;
1424 int prognum = 0;
1425 struct pipe *pi;
1426 pid_t childpid;
1427
1428 attributes = WUNTRACED;
1429 if (fg_pipe==NULL) {
1430 attributes |= WNOHANG;
1431 }
1432
1433 while ((childpid = waitpid(-1, &status, attributes)) > 0) {
1434 if (fg_pipe) {
1435 int i, rcode = 0;
1436 for (i=0; i < fg_pipe->num_progs; i++) {
1437 if (fg_pipe->progs[i].pid == childpid) {
1438 if (i==fg_pipe->num_progs-1)
1439 rcode=WEXITSTATUS(status);
1440 (fg_pipe->num_progs)--;
1441 return(rcode);
1442 }
1443 }
1444 }
1445
1446 for (pi = job_list; pi; pi = pi->next) {
1447 prognum = 0;
1448 while (prognum < pi->num_progs && pi->progs[prognum].pid != childpid) {
1449 prognum++;
1450 }
1451 if (prognum < pi->num_progs)
1452 break;
1453 }
1454
1455 if(pi==NULL) {
1456 debug_printf("checkjobs: pid %d was not in our list!\n", childpid);
1457 continue;
1458 }
1459
1460 if (WIFEXITED(status) || WIFSIGNALED(status)) {
1461 /* child exited */
1462 pi->running_progs--;
1463 pi->progs[prognum].pid = 0;
1464
1465 if (!pi->running_progs) {
1466 printf(JOB_STATUS_FORMAT, pi->jobid, "Done", pi->text);
1467 remove_bg_job(pi);
1468 }
1469 } else {
1470 /* child stopped */
1471 pi->stopped_progs++;
1472 pi->progs[prognum].is_stopped = 1;
1473
1474#if 0
1475 /* Printing this stuff is a pain, since it tends to
1476 * overwrite the prompt an inconveinient moments. So
1477 * don't do that. */
1478 if (pi->stopped_progs == pi->num_progs) {
1479 printf("\n"JOB_STATUS_FORMAT, pi->jobid, "Stopped", pi->text);
1480 }
1481#endif
1482 }
1483 }
1484
1485 if (childpid == -1 && errno != ECHILD)
1486 perror_msg("waitpid");
1487
1488 /* move the shell to the foreground */
1489 /*if (interactive && tcsetpgrp(shell_terminal, getpgid(0))) */
1490 /* perror_msg("tcsetpgrp-2"); */
1491 return -1;
1492}
1493
1494/* Figure out our controlling tty, checking in order stderr,
1495 * stdin, and stdout. If check_pgrp is set, also check that
1496 * we belong to the foreground process group associated with
1497 * that tty. The value of shell_terminal is needed in order to call
1498 * tcsetpgrp(shell_terminal, ...); */
1499void controlling_tty(int check_pgrp)
1500{
1501 pid_t curpgrp;
1502
1503 if ((curpgrp = tcgetpgrp(shell_terminal = 2)) < 0
1504 && (curpgrp = tcgetpgrp(shell_terminal = 0)) < 0
1505 && (curpgrp = tcgetpgrp(shell_terminal = 1)) < 0)
1506 goto shell_terminal_error;
1507
1508 if (check_pgrp && curpgrp != getpgid(0))
1509 goto shell_terminal_error;
1510
1511 return;
1512
1513shell_terminal_error:
1514 shell_terminal = -1;
1515 return;
1516}
1517#endif
1518
1519/* run_pipe_real() starts all the jobs, but doesn't wait for anything
1520 * to finish. See checkjobs().
1521 *
1522 * return code is normally -1, when the caller has to wait for children
1523 * to finish to determine the exit status of the pipe. If the pipe
1524 * is a simple builtin command, however, the action is done by the
1525 * time run_pipe_real returns, and the exit code is provided as the
1526 * return value.
1527 *
1528 * The input of the pipe is always stdin, the output is always
1529 * stdout. The outpipe[] mechanism in BusyBox-0.48 lash is bogus,
1530 * because it tries to avoid running the command substitution in
1531 * subshell, when that is in fact necessary. The subshell process
1532 * now has its stdout directed to the input of the appropriate pipe,
1533 * so this routine is noticeably simpler.
1534 */
1535static int run_pipe_real(struct pipe *pi)
1536{
1537 int i;
1538#ifndef __U_BOOT__
1539 int nextin, nextout;
1540 int pipefds[2]; /* pipefds[0] is for reading */
1541 struct child_prog *child;
1542 struct built_in_command *x;
1543 char *p;
wdenkd0fb80c2003-01-11 09:48:40 +00001544# if __GNUC__
1545 /* Avoid longjmp clobbering */
1546 (void) &i;
1547 (void) &nextin;
1548 (void) &nextout;
1549 (void) &child;
1550# endif
wdenkfe8c2802002-11-03 00:38:21 +00001551#else
1552 int nextin;
1553 int flag = do_repeat ? CMD_FLAG_REPEAT : 0;
1554 struct child_prog *child;
wdenkfe8c2802002-11-03 00:38:21 +00001555 char *p;
wdenkd0fb80c2003-01-11 09:48:40 +00001556# if __GNUC__
1557 /* Avoid longjmp clobbering */
1558 (void) &i;
1559 (void) &nextin;
1560 (void) &child;
1561# endif
1562#endif /* __U_BOOT__ */
wdenkfe8c2802002-11-03 00:38:21 +00001563
1564 nextin = 0;
1565#ifndef __U_BOOT__
1566 pi->pgrp = -1;
1567#endif
1568
1569 /* Check if this is a simple builtin (not part of a pipe).
1570 * Builtins within pipes have to fork anyway, and are handled in
1571 * pseudo_exec. "echo foo | read bar" doesn't work on bash, either.
1572 */
1573 if (pi->num_progs == 1) child = & (pi->progs[0]);
1574#ifndef __U_BOOT__
1575 if (pi->num_progs == 1 && child->group && child->subshell == 0) {
1576 int squirrel[] = {-1, -1, -1};
1577 int rcode;
1578 debug_printf("non-subshell grouping\n");
1579 setup_redirects(child, squirrel);
1580 /* XXX could we merge code with following builtin case,
1581 * by creating a pseudo builtin that calls run_list_real? */
1582 rcode = run_list_real(child->group);
1583 restore_redirects(squirrel);
1584#else
1585 if (pi->num_progs == 1 && child->group) {
1586 int rcode;
1587 debug_printf("non-subshell grouping\n");
1588 rcode = run_list_real(child->group);
1589#endif
1590 return rcode;
1591 } else if (pi->num_progs == 1 && pi->progs[0].argv != NULL) {
1592 for (i=0; is_assignment(child->argv[i]); i++) { /* nothing */ }
1593 if (i!=0 && child->argv[i]==NULL) {
1594 /* assignments, but no command: set the local environment */
1595 for (i=0; child->argv[i]!=NULL; i++) {
1596
1597 /* Ok, this case is tricky. We have to decide if this is a
1598 * local variable, or an already exported variable. If it is
1599 * already exported, we have to export the new value. If it is
1600 * not exported, we need only set this as a local variable.
1601 * This junk is all to decide whether or not to export this
1602 * variable. */
1603 int export_me=0;
1604 char *name, *value;
1605 name = xstrdup(child->argv[i]);
1606 debug_printf("Local environment set: %s\n", name);
1607 value = strchr(name, '=');
1608 if (value)
1609 *value=0;
1610#ifndef __U_BOOT__
1611 if ( get_local_var(name)) {
1612 export_me=1;
1613 }
1614#endif
1615 free(name);
1616 p = insert_var_value(child->argv[i]);
1617 set_local_var(p, export_me);
1618 if (p != child->argv[i]) free(p);
1619 }
1620 return EXIT_SUCCESS; /* don't worry about errors in set_local_var() yet */
1621 }
1622 for (i = 0; is_assignment(child->argv[i]); i++) {
1623 p = insert_var_value(child->argv[i]);
1624#ifndef __U_BOOT__
1625 putenv(strdup(p));
1626#else
1627 set_local_var(p, 0);
1628#endif
1629 if (p != child->argv[i]) {
1630 child->sp--;
1631 free(p);
1632 }
1633 }
1634 if (child->sp) {
1635 char * str = NULL;
1636
Stephen Warrenfe9ca3d2014-03-01 22:16:10 -07001637 str = make_string(child->argv + i,
1638 child->argv_nonnull + i);
wdenkfe8c2802002-11-03 00:38:21 +00001639 parse_string_outer(str, FLAG_EXIT_FROM_LOOP | FLAG_REPARSING);
1640 free(str);
1641 return last_return_code;
1642 }
1643#ifndef __U_BOOT__
1644 for (x = bltins; x->cmd; x++) {
1645 if (strcmp(child->argv[i], x->cmd) == 0 ) {
1646 int squirrel[] = {-1, -1, -1};
1647 int rcode;
1648 if (x->function == builtin_exec && child->argv[i+1]==NULL) {
1649 debug_printf("magic exec\n");
1650 setup_redirects(child,NULL);
1651 return EXIT_SUCCESS;
1652 }
1653 debug_printf("builtin inline %s\n", child->argv[0]);
1654 /* XXX setup_redirects acts on file descriptors, not FILEs.
1655 * This is perfect for work that comes after exec().
1656 * Is it really safe for inline use? Experimentally,
1657 * things seem to work with glibc. */
1658 setup_redirects(child, squirrel);
Simon Glass7344f912011-12-06 19:47:53 +00001659
1660 child->argv += i; /* XXX horrible hack */
1661 rcode = x->function(child);
1662 /* XXX restore hack so free() can work right */
1663 child->argv -= i;
1664 restore_redirects(squirrel);
1665 }
1666 return rcode;
1667 }
wdenkfe8c2802002-11-03 00:38:21 +00001668#else
Simon Glass9d12d5d2012-02-14 19:59:25 +00001669 /* check ";", because ,example , argv consist from
1670 * "help;flinfo" must not execute
1671 */
1672 if (strchr(child->argv[i], ';')) {
1673 printf("Unknown command '%s' - try 'help' or use "
1674 "'run' command\n", child->argv[i]);
1675 return -1;
wdenkfe8c2802002-11-03 00:38:21 +00001676 }
Simon Glass9d12d5d2012-02-14 19:59:25 +00001677 /* Process the command */
1678 return cmd_process(flag, child->argc, child->argv,
Richard Genoud34765e82012-12-03 06:28:28 +00001679 &flag_repeat, NULL);
Simon Glass9d12d5d2012-02-14 19:59:25 +00001680#endif
wdenkfe8c2802002-11-03 00:38:21 +00001681 }
Simon Glass9d12d5d2012-02-14 19:59:25 +00001682#ifndef __U_BOOT__
wdenkfe8c2802002-11-03 00:38:21 +00001683
1684 for (i = 0; i < pi->num_progs; i++) {
1685 child = & (pi->progs[i]);
1686
1687 /* pipes are inserted between pairs of commands */
1688 if ((i + 1) < pi->num_progs) {
1689 if (pipe(pipefds)<0) perror_msg_and_die("pipe");
1690 nextout = pipefds[1];
1691 } else {
1692 nextout=1;
1693 pipefds[0] = -1;
1694 }
1695
1696 /* XXX test for failed fork()? */
1697 if (!(child->pid = fork())) {
1698 /* Set the handling for job control signals back to the default. */
1699 signal(SIGINT, SIG_DFL);
1700 signal(SIGQUIT, SIG_DFL);
1701 signal(SIGTERM, SIG_DFL);
1702 signal(SIGTSTP, SIG_DFL);
1703 signal(SIGTTIN, SIG_DFL);
1704 signal(SIGTTOU, SIG_DFL);
1705 signal(SIGCHLD, SIG_DFL);
1706
1707 close_all();
1708
1709 if (nextin != 0) {
1710 dup2(nextin, 0);
1711 close(nextin);
1712 }
1713 if (nextout != 1) {
1714 dup2(nextout, 1);
1715 close(nextout);
1716 }
1717 if (pipefds[0]!=-1) {
1718 close(pipefds[0]); /* opposite end of our output pipe */
1719 }
1720
1721 /* Like bash, explicit redirects override pipes,
1722 * and the pipe fd is available for dup'ing. */
1723 setup_redirects(child,NULL);
1724
1725 if (interactive && pi->followup!=PIPE_BG) {
1726 /* If we (the child) win the race, put ourselves in the process
1727 * group whose leader is the first process in this pipe. */
1728 if (pi->pgrp < 0) {
1729 pi->pgrp = getpid();
1730 }
1731 if (setpgid(0, pi->pgrp) == 0) {
1732 tcsetpgrp(2, pi->pgrp);
1733 }
1734 }
1735
1736 pseudo_exec(child);
1737 }
1738
1739
1740 /* put our child in the process group whose leader is the
1741 first process in this pipe */
1742 if (pi->pgrp < 0) {
1743 pi->pgrp = child->pid;
1744 }
1745 /* Don't check for errors. The child may be dead already,
1746 * in which case setpgid returns error code EACCES. */
1747 setpgid(child->pid, pi->pgrp);
1748
1749 if (nextin != 0)
1750 close(nextin);
1751 if (nextout != 1)
1752 close(nextout);
1753
1754 /* If there isn't another process, nextin is garbage
1755 but it doesn't matter */
1756 nextin = pipefds[0];
1757 }
1758#endif
1759 return -1;
1760}
1761
1762static int run_list_real(struct pipe *pi)
1763{
1764 char *save_name = NULL;
1765 char **list = NULL;
1766 char **save_list = NULL;
1767 struct pipe *rpipe;
1768 int flag_rep = 0;
1769#ifndef __U_BOOT__
1770 int save_num_progs;
1771#endif
1772 int rcode=0, flag_skip=1;
1773 int flag_restore = 0;
1774 int if_code=0, next_if_code=0; /* need double-buffer to handle elif */
1775 reserved_style rmode, skip_more_in_this_rmode=RES_XXXX;
1776 /* check syntax for "for" */
1777 for (rpipe = pi; rpipe; rpipe = rpipe->next) {
1778 if ((rpipe->r_mode == RES_IN ||
1779 rpipe->r_mode == RES_FOR) &&
1780 (rpipe->next == NULL)) {
1781 syntax();
1782#ifdef __U_BOOT__
1783 flag_repeat = 0;
1784#endif
1785 return 1;
1786 }
1787 if ((rpipe->r_mode == RES_IN &&
1788 (rpipe->next->r_mode == RES_IN &&
1789 rpipe->next->progs->argv != NULL))||
1790 (rpipe->r_mode == RES_FOR &&
1791 rpipe->next->r_mode != RES_IN)) {
1792 syntax();
1793#ifdef __U_BOOT__
1794 flag_repeat = 0;
1795#endif
1796 return 1;
1797 }
1798 }
1799 for (; pi; pi = (flag_restore != 0) ? rpipe : pi->next) {
1800 if (pi->r_mode == RES_WHILE || pi->r_mode == RES_UNTIL ||
1801 pi->r_mode == RES_FOR) {
1802#ifdef __U_BOOT__
1803 /* check Ctrl-C */
1804 ctrlc();
1805 if ((had_ctrlc())) {
1806 return 1;
1807 }
1808#endif
1809 flag_restore = 0;
1810 if (!rpipe) {
1811 flag_rep = 0;
1812 rpipe = pi;
1813 }
1814 }
1815 rmode = pi->r_mode;
1816 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);
1817 if (rmode == skip_more_in_this_rmode && flag_skip) {
1818 if (pi->followup == PIPE_SEQ) flag_skip=0;
1819 continue;
1820 }
1821 flag_skip = 1;
1822 skip_more_in_this_rmode = RES_XXXX;
1823 if (rmode == RES_THEN || rmode == RES_ELSE) if_code = next_if_code;
1824 if (rmode == RES_THEN && if_code) continue;
1825 if (rmode == RES_ELSE && !if_code) continue;
wdenk56b86bf2004-04-12 14:31:43 +00001826 if (rmode == RES_ELIF && !if_code) break;
wdenkfe8c2802002-11-03 00:38:21 +00001827 if (rmode == RES_FOR && pi->num_progs) {
1828 if (!list) {
1829 /* if no variable values after "in" we skip "for" */
1830 if (!pi->next->progs->argv) continue;
1831 /* create list of variable values */
1832 list = make_list_in(pi->next->progs->argv,
1833 pi->progs->argv[0]);
1834 save_list = list;
1835 save_name = pi->progs->argv[0];
1836 pi->progs->argv[0] = NULL;
1837 flag_rep = 1;
1838 }
1839 if (!(*list)) {
1840 free(pi->progs->argv[0]);
1841 free(save_list);
1842 list = NULL;
1843 flag_rep = 0;
1844 pi->progs->argv[0] = save_name;
1845#ifndef __U_BOOT__
1846 pi->progs->glob_result.gl_pathv[0] =
1847 pi->progs->argv[0];
1848#endif
1849 continue;
1850 } else {
1851 /* insert new value from list for variable */
1852 if (pi->progs->argv[0])
1853 free(pi->progs->argv[0]);
1854 pi->progs->argv[0] = *list++;
1855#ifndef __U_BOOT__
1856 pi->progs->glob_result.gl_pathv[0] =
1857 pi->progs->argv[0];
1858#endif
1859 }
1860 }
1861 if (rmode == RES_IN) continue;
1862 if (rmode == RES_DO) {
1863 if (!flag_rep) continue;
1864 }
Jeroen Hofstee930e4252014-06-11 00:28:47 +02001865 if (rmode == RES_DONE) {
wdenkfe8c2802002-11-03 00:38:21 +00001866 if (flag_rep) {
1867 flag_restore = 1;
1868 } else {
1869 rpipe = NULL;
1870 }
1871 }
1872 if (pi->num_progs == 0) continue;
1873#ifndef __U_BOOT__
1874 save_num_progs = pi->num_progs; /* save number of programs */
1875#endif
1876 rcode = run_pipe_real(pi);
1877 debug_printf("run_pipe_real returned %d\n",rcode);
1878#ifndef __U_BOOT__
1879 if (rcode!=-1) {
1880 /* We only ran a builtin: rcode was set by the return value
1881 * of run_pipe_real(), and we don't need to wait for anything. */
1882 } else if (pi->followup==PIPE_BG) {
1883 /* XXX check bash's behavior with nontrivial pipes */
1884 /* XXX compute jobid */
1885 /* XXX what does bash do with attempts to background builtins? */
1886 insert_bg_job(pi);
1887 rcode = EXIT_SUCCESS;
1888 } else {
1889 if (interactive) {
1890 /* move the new process group into the foreground */
1891 if (tcsetpgrp(shell_terminal, pi->pgrp) && errno != ENOTTY)
1892 perror_msg("tcsetpgrp-3");
1893 rcode = checkjobs(pi);
1894 /* move the shell to the foreground */
1895 if (tcsetpgrp(shell_terminal, getpgid(0)) && errno != ENOTTY)
1896 perror_msg("tcsetpgrp-4");
1897 } else {
1898 rcode = checkjobs(pi);
1899 }
1900 debug_printf("checkjobs returned %d\n",rcode);
1901 }
1902 last_return_code=rcode;
1903#else
wdenkc26e4542004-04-18 10:13:26 +00001904 if (rcode < -1) {
1905 last_return_code = -rcode - 2;
1906 return -2; /* exit */
1907 }
wdenkfe8c2802002-11-03 00:38:21 +00001908 last_return_code=(rcode == 0) ? 0 : 1;
1909#endif
1910#ifndef __U_BOOT__
1911 pi->num_progs = save_num_progs; /* restore number of programs */
1912#endif
1913 if ( rmode == RES_IF || rmode == RES_ELIF )
1914 next_if_code=rcode; /* can be overwritten a number of times */
1915 if (rmode == RES_WHILE)
1916 flag_rep = !last_return_code;
1917 if (rmode == RES_UNTIL)
1918 flag_rep = last_return_code;
1919 if ( (rcode==EXIT_SUCCESS && pi->followup==PIPE_OR) ||
1920 (rcode!=EXIT_SUCCESS && pi->followup==PIPE_AND) )
1921 skip_more_in_this_rmode=rmode;
1922#ifndef __U_BOOT__
1923 checkjobs(NULL);
1924#endif
1925 }
1926 return rcode;
1927}
1928
1929/* broken, of course, but OK for testing */
1930static char *indenter(int i)
1931{
1932 static char blanks[]=" ";
1933 return &blanks[sizeof(blanks)-i-1];
1934}
1935
1936/* return code is the exit status of the pipe */
1937static int free_pipe(struct pipe *pi, int indent)
1938{
1939 char **p;
1940 struct child_prog *child;
1941#ifndef __U_BOOT__
1942 struct redir_struct *r, *rnext;
1943#endif
1944 int a, i, ret_code=0;
1945 char *ind = indenter(indent);
1946
1947#ifndef __U_BOOT__
1948 if (pi->stopped_progs > 0)
1949 return ret_code;
1950 final_printf("%s run pipe: (pid %d)\n",ind,getpid());
1951#endif
1952 for (i=0; i<pi->num_progs; i++) {
1953 child = &pi->progs[i];
1954 final_printf("%s command %d:\n",ind,i);
1955 if (child->argv) {
1956 for (a=0,p=child->argv; *p; a++,p++) {
1957 final_printf("%s argv[%d] = %s\n",ind,a,*p);
1958 }
1959#ifndef __U_BOOT__
1960 globfree(&child->glob_result);
1961#else
Peter Tyser197324d2009-08-05 16:18:44 -05001962 for (a = 0; a < child->argc; a++) {
wdenk8bde7f72003-06-27 21:31:46 +00001963 free(child->argv[a]);
1964 }
Stephen Warrenfe9ca3d2014-03-01 22:16:10 -07001965 free(child->argv);
1966 free(child->argv_nonnull);
wdenk8bde7f72003-06-27 21:31:46 +00001967 child->argc = 0;
wdenkfe8c2802002-11-03 00:38:21 +00001968#endif
1969 child->argv=NULL;
1970 } else if (child->group) {
1971#ifndef __U_BOOT__
1972 final_printf("%s begin group (subshell:%d)\n",ind, child->subshell);
1973#endif
1974 ret_code = free_pipe_list(child->group,indent+3);
1975 final_printf("%s end group\n",ind);
1976 } else {
1977 final_printf("%s (nil)\n",ind);
1978 }
1979#ifndef __U_BOOT__
1980 for (r=child->redirects; r; r=rnext) {
1981 final_printf("%s redirect %d%s", ind, r->fd, redir_table[r->type].descrip);
1982 if (r->dup == -1) {
1983 /* guard against the case >$FOO, where foo is unset or blank */
1984 if (r->word.gl_pathv) {
1985 final_printf(" %s\n", *r->word.gl_pathv);
1986 globfree(&r->word);
1987 }
1988 } else {
1989 final_printf("&%d\n", r->dup);
1990 }
1991 rnext=r->next;
1992 free(r);
1993 }
1994 child->redirects=NULL;
1995#endif
1996 }
1997 free(pi->progs); /* children are an array, they get freed all at once */
1998 pi->progs=NULL;
1999 return ret_code;
2000}
2001
2002static int free_pipe_list(struct pipe *head, int indent)
2003{
2004 int rcode=0; /* if list has no members */
2005 struct pipe *pi, *next;
2006 char *ind = indenter(indent);
2007 for (pi=head; pi; pi=next) {
2008 final_printf("%s pipe reserved mode %d\n", ind, pi->r_mode);
2009 rcode = free_pipe(pi, indent);
2010 final_printf("%s pipe followup code %d\n", ind, pi->followup);
2011 next=pi->next;
2012 pi->next=NULL;
2013 free(pi);
2014 }
2015 return rcode;
2016}
2017
2018/* Select which version we will use */
2019static int run_list(struct pipe *pi)
2020{
2021 int rcode=0;
2022#ifndef __U_BOOT__
2023 if (fake_mode==0) {
2024#endif
2025 rcode = run_list_real(pi);
2026#ifndef __U_BOOT__
2027 }
2028#endif
2029 /* free_pipe_list has the side effect of clearing memory
2030 * In the long run that function can be merged with run_list_real,
2031 * but doing that now would hobble the debugging effort. */
2032 free_pipe_list(pi,0);
2033 return rcode;
2034}
2035
2036/* The API for glob is arguably broken. This routine pushes a non-matching
2037 * string into the output structure, removing non-backslashed backslashes.
2038 * If someone can prove me wrong, by performing this function within the
2039 * original glob(3) api, feel free to rewrite this routine into oblivion.
2040 * Return code (0 vs. GLOB_NOSPACE) matches glob(3).
2041 * XXX broken if the last character is '\\', check that before calling.
2042 */
2043#ifndef __U_BOOT__
2044static int globhack(const char *src, int flags, glob_t *pglob)
2045{
2046 int cnt=0, pathc;
2047 const char *s;
2048 char *dest;
2049 for (cnt=1, s=src; s && *s; s++) {
2050 if (*s == '\\') s++;
2051 cnt++;
2052 }
2053 dest = malloc(cnt);
2054 if (!dest) return GLOB_NOSPACE;
2055 if (!(flags & GLOB_APPEND)) {
2056 pglob->gl_pathv=NULL;
2057 pglob->gl_pathc=0;
2058 pglob->gl_offs=0;
2059 pglob->gl_offs=0;
2060 }
2061 pathc = ++pglob->gl_pathc;
2062 pglob->gl_pathv = realloc(pglob->gl_pathv, (pathc+1)*sizeof(*pglob->gl_pathv));
2063 if (pglob->gl_pathv == NULL) return GLOB_NOSPACE;
2064 pglob->gl_pathv[pathc-1]=dest;
2065 pglob->gl_pathv[pathc]=NULL;
2066 for (s=src; s && *s; s++, dest++) {
2067 if (*s == '\\') s++;
2068 *dest = *s;
2069 }
2070 *dest='\0';
2071 return 0;
2072}
2073
2074/* XXX broken if the last character is '\\', check that before calling */
2075static int glob_needed(const char *s)
2076{
2077 for (; *s; s++) {
2078 if (*s == '\\') s++;
2079 if (strchr("*[?",*s)) return 1;
2080 }
2081 return 0;
2082}
2083
2084#if 0
2085static void globprint(glob_t *pglob)
2086{
2087 int i;
2088 debug_printf("glob_t at %p:\n", pglob);
2089 debug_printf(" gl_pathc=%d gl_pathv=%p gl_offs=%d gl_flags=%d\n",
2090 pglob->gl_pathc, pglob->gl_pathv, pglob->gl_offs, pglob->gl_flags);
2091 for (i=0; i<pglob->gl_pathc; i++)
2092 debug_printf("pglob->gl_pathv[%d] = %p = %s\n", i,
2093 pglob->gl_pathv[i], pglob->gl_pathv[i]);
2094}
2095#endif
2096
2097static int xglob(o_string *dest, int flags, glob_t *pglob)
2098{
2099 int gr;
2100
wdenk8bde7f72003-06-27 21:31:46 +00002101 /* short-circuit for null word */
wdenkfe8c2802002-11-03 00:38:21 +00002102 /* we can code this better when the debug_printf's are gone */
wdenk8bde7f72003-06-27 21:31:46 +00002103 if (dest->length == 0) {
2104 if (dest->nonnull) {
2105 /* bash man page calls this an "explicit" null */
2106 gr = globhack(dest->data, flags, pglob);
2107 debug_printf("globhack returned %d\n",gr);
2108 } else {
wdenkfe8c2802002-11-03 00:38:21 +00002109 return 0;
2110 }
wdenk8bde7f72003-06-27 21:31:46 +00002111 } else if (glob_needed(dest->data)) {
wdenkfe8c2802002-11-03 00:38:21 +00002112 gr = glob(dest->data, flags, NULL, pglob);
2113 debug_printf("glob returned %d\n",gr);
2114 if (gr == GLOB_NOMATCH) {
2115 /* quote removal, or more accurately, backslash removal */
2116 gr = globhack(dest->data, flags, pglob);
2117 debug_printf("globhack returned %d\n",gr);
2118 }
2119 } else {
2120 gr = globhack(dest->data, flags, pglob);
2121 debug_printf("globhack returned %d\n",gr);
2122 }
2123 if (gr == GLOB_NOSPACE)
2124 error_msg_and_die("out of memory during glob");
2125 if (gr != 0) { /* GLOB_ABORTED ? */
2126 error_msg("glob(3) error %d",gr);
2127 }
2128 /* globprint(glob_target); */
2129 return gr;
2130}
2131#endif
2132
wdenkc26e4542004-04-18 10:13:26 +00002133#ifdef __U_BOOT__
2134static char *get_dollar_var(char ch);
2135#endif
2136
wdenkfe8c2802002-11-03 00:38:21 +00002137/* This is used to get/check local shell variables */
Holger Brunckeae3b062011-04-08 02:47:42 +00002138char *get_local_var(const char *s)
wdenkfe8c2802002-11-03 00:38:21 +00002139{
2140 struct variables *cur;
2141
2142 if (!s)
2143 return NULL;
wdenkc26e4542004-04-18 10:13:26 +00002144
2145#ifdef __U_BOOT__
2146 if (*s == '$')
2147 return get_dollar_var(s[1]);
2148#endif
2149
wdenkfe8c2802002-11-03 00:38:21 +00002150 for (cur = top_vars; cur; cur=cur->next)
2151 if(strcmp(cur->name, s)==0)
2152 return cur->value;
2153 return NULL;
2154}
2155
2156/* This is used to set local shell variables
2157 flg_export==0 if only local (not exporting) variable
2158 flg_export==1 if "new" exporting environ
2159 flg_export>1 if current startup environ (not call putenv()) */
Heiko Schocher81473f62008-10-15 09:40:28 +02002160int set_local_var(const char *s, int flg_export)
wdenkfe8c2802002-11-03 00:38:21 +00002161{
2162 char *name, *value;
2163 int result=0;
2164 struct variables *cur;
2165
wdenkc26e4542004-04-18 10:13:26 +00002166#ifdef __U_BOOT__
2167 /* might be possible! */
2168 if (!isalpha(*s))
2169 return -1;
2170#endif
2171
wdenkfe8c2802002-11-03 00:38:21 +00002172 name=strdup(s);
2173
2174#ifdef __U_BOOT__
2175 if (getenv(name) != NULL) {
2176 printf ("ERROR: "
wdenk2d1a5372004-02-23 19:30:57 +00002177 "There is a global environment variable with the same name.\n");
wdenkc26e4542004-04-18 10:13:26 +00002178 free(name);
wdenkfe8c2802002-11-03 00:38:21 +00002179 return -1;
2180 }
2181#endif
2182 /* Assume when we enter this function that we are already in
2183 * NAME=VALUE format. So the first order of business is to
2184 * split 's' on the '=' into 'name' and 'value' */
2185 value = strchr(name, '=');
Peng Fanaa722522015-11-24 16:54:21 +08002186 if (value == NULL || *(value + 1) == 0) {
wdenkfe8c2802002-11-03 00:38:21 +00002187 free(name);
2188 return -1;
2189 }
2190 *value++ = 0;
2191
2192 for(cur = top_vars; cur; cur = cur->next) {
2193 if(strcmp(cur->name, name)==0)
2194 break;
2195 }
2196
2197 if(cur) {
2198 if(strcmp(cur->value, value)==0) {
2199 if(flg_export>0 && cur->flg_export==0)
2200 cur->flg_export=flg_export;
2201 else
2202 result++;
2203 } else {
2204 if(cur->flg_read_only) {
2205 error_msg("%s: readonly variable", name);
2206 result = -1;
2207 } else {
2208 if(flg_export>0 || cur->flg_export>1)
2209 cur->flg_export=1;
2210 free(cur->value);
2211
2212 cur->value = strdup(value);
2213 }
2214 }
2215 } else {
2216 cur = malloc(sizeof(struct variables));
2217 if(!cur) {
2218 result = -1;
2219 } else {
2220 cur->name = strdup(name);
Kim Phillips199adb62012-10-29 13:34:32 +00002221 if (cur->name == NULL) {
wdenkfe8c2802002-11-03 00:38:21 +00002222 free(cur);
2223 result = -1;
2224 } else {
2225 struct variables *bottom = top_vars;
2226 cur->value = strdup(value);
Kim Phillips199adb62012-10-29 13:34:32 +00002227 cur->next = NULL;
wdenkfe8c2802002-11-03 00:38:21 +00002228 cur->flg_export = flg_export;
2229 cur->flg_read_only = 0;
2230 while(bottom->next) bottom=bottom->next;
2231 bottom->next = cur;
2232 }
2233 }
2234 }
2235
2236#ifndef __U_BOOT__
2237 if(result==0 && cur->flg_export==1) {
2238 *(value-1) = '=';
2239 result = putenv(name);
2240 } else {
2241#endif
2242 free(name);
2243#ifndef __U_BOOT__
2244 if(result>0) /* equivalent to previous set */
2245 result = 0;
2246 }
2247#endif
2248 return result;
2249}
2250
Heiko Schocher81473f62008-10-15 09:40:28 +02002251void unset_local_var(const char *name)
wdenkfe8c2802002-11-03 00:38:21 +00002252{
2253 struct variables *cur;
2254
2255 if (name) {
2256 for (cur = top_vars; cur; cur=cur->next) {
2257 if(strcmp(cur->name, name)==0)
2258 break;
2259 }
Kim Phillips199adb62012-10-29 13:34:32 +00002260 if (cur != NULL) {
wdenkfe8c2802002-11-03 00:38:21 +00002261 struct variables *next = top_vars;
2262 if(cur->flg_read_only) {
2263 error_msg("%s: readonly variable", name);
2264 return;
2265 } else {
Heiko Schocher81473f62008-10-15 09:40:28 +02002266#ifndef __U_BOOT__
wdenkfe8c2802002-11-03 00:38:21 +00002267 if(cur->flg_export)
2268 unsetenv(cur->name);
Heiko Schocher81473f62008-10-15 09:40:28 +02002269#endif
wdenkfe8c2802002-11-03 00:38:21 +00002270 free(cur->name);
2271 free(cur->value);
2272 while (next->next != cur)
2273 next = next->next;
2274 next->next = cur->next;
2275 }
2276 free(cur);
2277 }
2278 }
2279}
wdenkfe8c2802002-11-03 00:38:21 +00002280
2281static int is_assignment(const char *s)
2282{
wdenkc26e4542004-04-18 10:13:26 +00002283 if (s == NULL)
2284 return 0;
2285
2286 if (!isalpha(*s)) return 0;
wdenkfe8c2802002-11-03 00:38:21 +00002287 ++s;
2288 while(isalnum(*s) || *s=='_') ++s;
2289 return *s=='=';
2290}
2291
2292#ifndef __U_BOOT__
2293/* the src parameter allows us to peek forward to a possible &n syntax
2294 * for file descriptor duplication, e.g., "2>&1".
2295 * Return code is 0 normally, 1 if a syntax error is detected in src.
2296 * Resource errors (in xmalloc) cause the process to exit */
2297static int setup_redirect(struct p_context *ctx, int fd, redir_type style,
2298 struct in_str *input)
2299{
2300 struct child_prog *child=ctx->child;
2301 struct redir_struct *redir = child->redirects;
2302 struct redir_struct *last_redir=NULL;
2303
2304 /* Create a new redir_struct and drop it onto the end of the linked list */
2305 while(redir) {
2306 last_redir=redir;
2307 redir=redir->next;
2308 }
2309 redir = xmalloc(sizeof(struct redir_struct));
2310 redir->next=NULL;
2311 redir->word.gl_pathv=NULL;
2312 if (last_redir) {
2313 last_redir->next=redir;
2314 } else {
2315 child->redirects=redir;
2316 }
2317
2318 redir->type=style;
2319 redir->fd= (fd==-1) ? redir_table[style].default_fd : fd ;
2320
2321 debug_printf("Redirect type %d%s\n", redir->fd, redir_table[style].descrip);
2322
2323 /* Check for a '2>&1' type redirect */
2324 redir->dup = redirect_dup_num(input);
2325 if (redir->dup == -2) return 1; /* syntax error */
2326 if (redir->dup != -1) {
2327 /* Erik had a check here that the file descriptor in question
2328 * is legit; I postpone that to "run time"
2329 * A "-" representation of "close me" shows up as a -3 here */
2330 debug_printf("Duplicating redirect '%d>&%d'\n", redir->fd, redir->dup);
2331 } else {
2332 /* We do _not_ try to open the file that src points to,
2333 * since we need to return and let src be expanded first.
2334 * Set ctx->pending_redirect, so we know what to do at the
2335 * end of the next parsed word.
2336 */
2337 ctx->pending_redirect = redir;
2338 }
2339 return 0;
2340}
2341#endif
2342
Kim Phillips199adb62012-10-29 13:34:32 +00002343static struct pipe *new_pipe(void)
2344{
wdenkfe8c2802002-11-03 00:38:21 +00002345 struct pipe *pi;
2346 pi = xmalloc(sizeof(struct pipe));
2347 pi->num_progs = 0;
2348 pi->progs = NULL;
2349 pi->next = NULL;
2350 pi->followup = 0; /* invalid */
Wolfgang Denke98f68b2005-09-28 01:49:47 +02002351 pi->r_mode = RES_NONE;
wdenkfe8c2802002-11-03 00:38:21 +00002352 return pi;
2353}
2354
2355static void initialize_context(struct p_context *ctx)
2356{
2357 ctx->pipe=NULL;
2358#ifndef __U_BOOT__
2359 ctx->pending_redirect=NULL;
2360#endif
2361 ctx->child=NULL;
2362 ctx->list_head=new_pipe();
2363 ctx->pipe=ctx->list_head;
2364 ctx->w=RES_NONE;
2365 ctx->stack=NULL;
2366#ifdef __U_BOOT__
2367 ctx->old_flag=0;
2368#endif
2369 done_command(ctx); /* creates the memory for working child */
2370}
2371
2372/* normal return is 0
2373 * if a reserved word is found, and processed, return 1
2374 * should handle if, then, elif, else, fi, for, while, until, do, done.
2375 * case, function, and select are obnoxious, save those for later.
2376 */
wdenk3e386912003-04-05 00:53:31 +00002377struct reserved_combo {
2378 char *literal;
2379 int code;
2380 long flag;
2381};
2382/* Mostly a list of accepted follow-up reserved words.
2383 * FLAG_END means we are done with the sequence, and are ready
2384 * to turn the compound list into a command.
2385 * FLAG_START means the word must start a new compound list.
2386 */
2387static struct reserved_combo reserved_list[] = {
2388 { "if", RES_IF, FLAG_THEN | FLAG_START },
2389 { "then", RES_THEN, FLAG_ELIF | FLAG_ELSE | FLAG_FI },
2390 { "elif", RES_ELIF, FLAG_THEN },
2391 { "else", RES_ELSE, FLAG_FI },
2392 { "fi", RES_FI, FLAG_END },
2393 { "for", RES_FOR, FLAG_IN | FLAG_START },
2394 { "while", RES_WHILE, FLAG_DO | FLAG_START },
2395 { "until", RES_UNTIL, FLAG_DO | FLAG_START },
2396 { "in", RES_IN, FLAG_DO },
2397 { "do", RES_DO, FLAG_DONE },
2398 { "done", RES_DONE, FLAG_END }
2399};
2400#define NRES (sizeof(reserved_list)/sizeof(struct reserved_combo))
2401
Kim Phillips199adb62012-10-29 13:34:32 +00002402static int reserved_word(o_string *dest, struct p_context *ctx)
wdenkfe8c2802002-11-03 00:38:21 +00002403{
wdenkfe8c2802002-11-03 00:38:21 +00002404 struct reserved_combo *r;
2405 for (r=reserved_list;
wdenkfe8c2802002-11-03 00:38:21 +00002406 r<reserved_list+NRES; r++) {
2407 if (strcmp(dest->data, r->literal) == 0) {
2408 debug_printf("found reserved word %s, code %d\n",r->literal,r->code);
2409 if (r->flag & FLAG_START) {
2410 struct p_context *new = xmalloc(sizeof(struct p_context));
2411 debug_printf("push stack\n");
2412 if (ctx->w == RES_IN || ctx->w == RES_FOR) {
2413 syntax();
2414 free(new);
2415 ctx->w = RES_SNTX;
2416 b_reset(dest);
2417 return 1;
2418 }
2419 *new = *ctx; /* physical copy */
2420 initialize_context(ctx);
2421 ctx->stack=new;
2422 } else if ( ctx->w == RES_NONE || ! (ctx->old_flag & (1<<r->code))) {
2423 syntax();
2424 ctx->w = RES_SNTX;
2425 b_reset(dest);
2426 return 1;
2427 }
2428 ctx->w=r->code;
2429 ctx->old_flag = r->flag;
2430 if (ctx->old_flag & FLAG_END) {
2431 struct p_context *old;
2432 debug_printf("pop stack\n");
2433 done_pipe(ctx,PIPE_SEQ);
2434 old = ctx->stack;
2435 old->child->group = ctx->list_head;
2436#ifndef __U_BOOT__
2437 old->child->subshell = 0;
2438#endif
2439 *ctx = *old; /* physical copy */
2440 free(old);
2441 }
2442 b_reset (dest);
2443 return 1;
2444 }
2445 }
2446 return 0;
2447}
2448
2449/* normal return is 0.
2450 * Syntax or xglob errors return 1. */
2451static int done_word(o_string *dest, struct p_context *ctx)
2452{
2453 struct child_prog *child=ctx->child;
2454#ifndef __U_BOOT__
2455 glob_t *glob_target;
2456 int gr, flags = 0;
2457#else
2458 char *str, *s;
2459 int argc, cnt;
2460#endif
2461
2462 debug_printf("done_word: %s %p\n", dest->data, child);
2463 if (dest->length == 0 && !dest->nonnull) {
2464 debug_printf(" true null, ignored\n");
2465 return 0;
2466 }
2467#ifndef __U_BOOT__
2468 if (ctx->pending_redirect) {
2469 glob_target = &ctx->pending_redirect->word;
2470 } else {
2471#endif
2472 if (child->group) {
2473 syntax();
2474 return 1; /* syntax error, groups and arglists don't mix */
2475 }
2476 if (!child->argv && (ctx->type & FLAG_PARSE_SEMICOLON)) {
2477 debug_printf("checking %s for reserved-ness\n",dest->data);
2478 if (reserved_word(dest,ctx)) return ctx->w==RES_SNTX;
2479 }
2480#ifndef __U_BOOT__
2481 glob_target = &child->glob_result;
wdenk8bde7f72003-06-27 21:31:46 +00002482 if (child->argv) flags |= GLOB_APPEND;
wdenkfe8c2802002-11-03 00:38:21 +00002483#else
2484 for (cnt = 1, s = dest->data; s && *s; s++) {
2485 if (*s == '\\') s++;
2486 cnt++;
2487 }
2488 str = malloc(cnt);
2489 if (!str) return 1;
2490 if ( child->argv == NULL) {
2491 child->argc=0;
2492 }
2493 argc = ++child->argc;
2494 child->argv = realloc(child->argv, (argc+1)*sizeof(*child->argv));
Peng Fanc6bb23c2015-11-27 10:12:02 +08002495 if (child->argv == NULL) {
2496 free(str);
2497 return 1;
2498 }
Stephen Warrenfe9ca3d2014-03-01 22:16:10 -07002499 child->argv_nonnull = realloc(child->argv_nonnull,
2500 (argc+1)*sizeof(*child->argv_nonnull));
Peng Fanc6bb23c2015-11-27 10:12:02 +08002501 if (child->argv_nonnull == NULL) {
2502 free(str);
Stephen Warrenfe9ca3d2014-03-01 22:16:10 -07002503 return 1;
Peng Fanc6bb23c2015-11-27 10:12:02 +08002504 }
wdenkfe8c2802002-11-03 00:38:21 +00002505 child->argv[argc-1]=str;
Stephen Warrenfe9ca3d2014-03-01 22:16:10 -07002506 child->argv_nonnull[argc-1] = dest->nonnull;
wdenkfe8c2802002-11-03 00:38:21 +00002507 child->argv[argc]=NULL;
Stephen Warrenfe9ca3d2014-03-01 22:16:10 -07002508 child->argv_nonnull[argc] = 0;
wdenkfe8c2802002-11-03 00:38:21 +00002509 for (s = dest->data; s && *s; s++,str++) {
2510 if (*s == '\\') s++;
2511 *str = *s;
2512 }
2513 *str = '\0';
2514#endif
2515#ifndef __U_BOOT__
2516 }
2517 gr = xglob(dest, flags, glob_target);
2518 if (gr != 0) return 1;
2519#endif
2520
2521 b_reset(dest);
2522#ifndef __U_BOOT__
2523 if (ctx->pending_redirect) {
2524 ctx->pending_redirect=NULL;
2525 if (glob_target->gl_pathc != 1) {
2526 error_msg("ambiguous redirect");
2527 return 1;
2528 }
2529 } else {
2530 child->argv = glob_target->gl_pathv;
2531 }
2532#endif
2533 if (ctx->w == RES_FOR) {
2534 done_word(dest,ctx);
2535 done_pipe(ctx,PIPE_SEQ);
2536 }
2537 return 0;
2538}
2539
2540/* The only possible error here is out of memory, in which case
2541 * xmalloc exits. */
2542static int done_command(struct p_context *ctx)
2543{
2544 /* The child is really already in the pipe structure, so
2545 * advance the pipe counter and make a new, null child.
2546 * Only real trickiness here is that the uncommitted
2547 * child structure, to which ctx->child points, is not
2548 * counted in pi->num_progs. */
2549 struct pipe *pi=ctx->pipe;
2550 struct child_prog *prog=ctx->child;
2551
2552 if (prog && prog->group == NULL
wdenk8bde7f72003-06-27 21:31:46 +00002553 && prog->argv == NULL
wdenkfe8c2802002-11-03 00:38:21 +00002554#ifndef __U_BOOT__
wdenk8bde7f72003-06-27 21:31:46 +00002555 && prog->redirects == NULL) {
wdenkfe8c2802002-11-03 00:38:21 +00002556#else
2557 ) {
2558#endif
2559 debug_printf("done_command: skipping null command\n");
2560 return 0;
2561 } else if (prog) {
2562 pi->num_progs++;
2563 debug_printf("done_command: num_progs incremented to %d\n",pi->num_progs);
2564 } else {
2565 debug_printf("done_command: initializing\n");
2566 }
2567 pi->progs = xrealloc(pi->progs, sizeof(*pi->progs) * (pi->num_progs+1));
2568
2569 prog = pi->progs + pi->num_progs;
2570#ifndef __U_BOOT__
2571 prog->redirects = NULL;
2572#endif
2573 prog->argv = NULL;
Stephen Warrenfe9ca3d2014-03-01 22:16:10 -07002574 prog->argv_nonnull = NULL;
wdenkfe8c2802002-11-03 00:38:21 +00002575#ifndef __U_BOOT__
2576 prog->is_stopped = 0;
2577#endif
2578 prog->group = NULL;
2579#ifndef __U_BOOT__
2580 prog->glob_result.gl_pathv = NULL;
2581 prog->family = pi;
2582#endif
2583 prog->sp = 0;
2584 ctx->child = prog;
2585 prog->type = ctx->type;
2586
2587 /* but ctx->pipe and ctx->list_head remain unchanged */
2588 return 0;
2589}
2590
2591static int done_pipe(struct p_context *ctx, pipe_style type)
2592{
2593 struct pipe *new_p;
2594 done_command(ctx); /* implicit closure of previous command */
2595 debug_printf("done_pipe, type %d\n", type);
2596 ctx->pipe->followup = type;
2597 ctx->pipe->r_mode = ctx->w;
2598 new_p=new_pipe();
2599 ctx->pipe->next = new_p;
2600 ctx->pipe = new_p;
2601 ctx->child = NULL;
2602 done_command(ctx); /* set up new pipe to accept commands */
2603 return 0;
2604}
2605
2606#ifndef __U_BOOT__
2607/* peek ahead in the in_str to find out if we have a "&n" construct,
2608 * as in "2>&1", that represents duplicating a file descriptor.
2609 * returns either -2 (syntax error), -1 (no &), or the number found.
2610 */
2611static int redirect_dup_num(struct in_str *input)
2612{
2613 int ch, d=0, ok=0;
2614 ch = b_peek(input);
2615 if (ch != '&') return -1;
2616
2617 b_getch(input); /* get the & */
2618 ch=b_peek(input);
2619 if (ch == '-') {
2620 b_getch(input);
2621 return -3; /* "-" represents "close me" */
2622 }
2623 while (isdigit(ch)) {
2624 d = d*10+(ch-'0');
2625 ok=1;
2626 b_getch(input);
2627 ch = b_peek(input);
2628 }
2629 if (ok) return d;
2630
2631 error_msg("ambiguous redirect");
2632 return -2;
2633}
2634
2635/* If a redirect is immediately preceded by a number, that number is
2636 * supposed to tell which file descriptor to redirect. This routine
2637 * looks for such preceding numbers. In an ideal world this routine
2638 * needs to handle all the following classes of redirects...
2639 * echo 2>foo # redirects fd 2 to file "foo", nothing passed to echo
2640 * echo 49>foo # redirects fd 49 to file "foo", nothing passed to echo
2641 * echo -2>foo # redirects fd 1 to file "foo", "-2" passed to echo
2642 * echo 49x>foo # redirects fd 1 to file "foo", "49x" passed to echo
2643 * A -1 output from this program means no valid number was found, so the
2644 * caller should use the appropriate default for this redirection.
2645 */
2646static int redirect_opt_num(o_string *o)
2647{
2648 int num;
2649
2650 if (o->length==0) return -1;
2651 for(num=0; num<o->length; num++) {
2652 if (!isdigit(*(o->data+num))) {
2653 return -1;
2654 }
2655 }
2656 /* reuse num (and save an int) */
2657 num=atoi(o->data);
2658 b_reset(o);
2659 return num;
2660}
2661
2662FILE *generate_stream_from_list(struct pipe *head)
2663{
2664 FILE *pf;
2665#if 1
2666 int pid, channel[2];
2667 if (pipe(channel)<0) perror_msg_and_die("pipe");
2668 pid=fork();
2669 if (pid<0) {
2670 perror_msg_and_die("fork");
2671 } else if (pid==0) {
2672 close(channel[0]);
2673 if (channel[1] != 1) {
2674 dup2(channel[1],1);
2675 close(channel[1]);
2676 }
2677#if 0
2678#define SURROGATE "surrogate response"
2679 write(1,SURROGATE,sizeof(SURROGATE));
2680 _exit(run_list(head));
2681#else
2682 _exit(run_list_real(head)); /* leaks memory */
2683#endif
2684 }
2685 debug_printf("forked child %d\n",pid);
2686 close(channel[1]);
2687 pf = fdopen(channel[0],"r");
2688 debug_printf("pipe on FILE *%p\n",pf);
2689#else
2690 free_pipe_list(head,0);
2691 pf=popen("echo surrogate response","r");
2692 debug_printf("started fake pipe on FILE *%p\n",pf);
2693#endif
2694 return pf;
2695}
2696
2697/* this version hacked for testing purposes */
2698/* return code is exit status of the process that is run. */
2699static int process_command_subs(o_string *dest, struct p_context *ctx, struct in_str *input, int subst_end)
2700{
2701 int retcode;
2702 o_string result=NULL_O_STRING;
2703 struct p_context inner;
2704 FILE *p;
2705 struct in_str pipe_str;
2706 initialize_context(&inner);
2707
2708 /* recursion to generate command */
2709 retcode = parse_stream(&result, &inner, input, subst_end);
2710 if (retcode != 0) return retcode; /* syntax error or EOF */
2711 done_word(&result, &inner);
2712 done_pipe(&inner, PIPE_SEQ);
2713 b_free(&result);
2714
2715 p=generate_stream_from_list(inner.list_head);
2716 if (p==NULL) return 1;
2717 mark_open(fileno(p));
2718 setup_file_in_str(&pipe_str, p);
2719
2720 /* now send results of command back into original context */
2721 retcode = parse_stream(dest, ctx, &pipe_str, '\0');
2722 /* XXX In case of a syntax error, should we try to kill the child?
2723 * That would be tough to do right, so just read until EOF. */
2724 if (retcode == 1) {
2725 while (b_getch(&pipe_str)!=EOF) { /* discard */ };
2726 }
2727
2728 debug_printf("done reading from pipe, pclose()ing\n");
2729 /* This is the step that wait()s for the child. Should be pretty
2730 * safe, since we just read an EOF from its stdout. We could try
2731 * to better, by using wait(), and keeping track of background jobs
2732 * at the same time. That would be a lot of work, and contrary
2733 * to the KISS philosophy of this program. */
2734 mark_closed(fileno(p));
2735 retcode=pclose(p);
2736 free_pipe_list(inner.list_head,0);
2737 debug_printf("pclosed, retcode=%d\n",retcode);
2738 /* XXX this process fails to trim a single trailing newline */
2739 return retcode;
2740}
2741
2742static int parse_group(o_string *dest, struct p_context *ctx,
2743 struct in_str *input, int ch)
2744{
2745 int rcode, endch=0;
2746 struct p_context sub;
2747 struct child_prog *child = ctx->child;
2748 if (child->argv) {
2749 syntax();
2750 return 1; /* syntax error, groups and arglists don't mix */
2751 }
2752 initialize_context(&sub);
2753 switch(ch) {
2754 case '(': endch=')'; child->subshell=1; break;
2755 case '{': endch='}'; break;
2756 default: syntax(); /* really logic error */
2757 }
2758 rcode=parse_stream(dest,&sub,input,endch);
2759 done_word(dest,&sub); /* finish off the final word in the subcontext */
2760 done_pipe(&sub, PIPE_SEQ); /* and the final command there, too */
2761 child->group = sub.list_head;
2762 return rcode;
2763 /* child remains "open", available for possible redirects */
2764}
2765#endif
2766
2767/* basically useful version until someone wants to get fancier,
2768 * see the bash man page under "Parameter Expansion" */
2769static char *lookup_param(char *src)
2770{
wdenkc26e4542004-04-18 10:13:26 +00002771 char *p;
Joe Hershberger641b0d32012-08-17 10:26:29 +00002772 char *sep;
2773 char *default_val = NULL;
2774 int assign = 0;
2775 int expand_empty = 0;
wdenkc26e4542004-04-18 10:13:26 +00002776
2777 if (!src)
2778 return NULL;
2779
Joe Hershberger641b0d32012-08-17 10:26:29 +00002780 sep = strchr(src, ':');
2781
2782 if (sep) {
2783 *sep = '\0';
2784 if (*(sep + 1) == '-')
2785 default_val = sep+2;
2786 if (*(sep + 1) == '=') {
2787 default_val = sep+2;
2788 assign = 1;
2789 }
2790 if (*(sep + 1) == '+') {
2791 default_val = sep+2;
2792 expand_empty = 1;
2793 }
2794 }
2795
2796 p = getenv(src);
2797 if (!p)
2798 p = get_local_var(src);
2799
2800 if (!p || strlen(p) == 0) {
2801 p = default_val;
2802 if (assign) {
2803 char *var = malloc(strlen(src)+strlen(default_val)+2);
2804 if (var) {
2805 sprintf(var, "%s=%s", src, default_val);
2806 set_local_var(var, 0);
2807 }
2808 free(var);
2809 }
2810 } else if (expand_empty) {
2811 p += strlen(p);
2812 }
2813
2814 if (sep)
2815 *sep = ':';
wdenkc26e4542004-04-18 10:13:26 +00002816
wdenkfe8c2802002-11-03 00:38:21 +00002817 return p;
2818}
2819
wdenkc26e4542004-04-18 10:13:26 +00002820#ifdef __U_BOOT__
2821static char *get_dollar_var(char ch)
2822{
2823 static char buf[40];
2824
2825 buf[0] = '\0';
2826 switch (ch) {
2827 case '?':
2828 sprintf(buf, "%u", (unsigned int)last_return_code);
2829 break;
2830 default:
2831 return NULL;
2832 }
2833 return buf;
2834}
2835#endif
2836
wdenkfe8c2802002-11-03 00:38:21 +00002837/* return code: 0 for OK, 1 for syntax error */
2838static int handle_dollar(o_string *dest, struct p_context *ctx, struct in_str *input)
2839{
2840#ifndef __U_BOOT__
2841 int i, advance=0;
2842#else
2843 int advance=0;
2844#endif
2845#ifndef __U_BOOT__
2846 char sep[]=" ";
2847#endif
2848 int ch = input->peek(input); /* first character after the $ */
2849 debug_printf("handle_dollar: ch=%c\n",ch);
2850 if (isalpha(ch)) {
2851 b_addchr(dest, SPECIAL_VAR_SYMBOL);
2852 ctx->child->sp++;
2853 while(ch=b_peek(input),isalnum(ch) || ch=='_') {
2854 b_getch(input);
2855 b_addchr(dest,ch);
2856 }
2857 b_addchr(dest, SPECIAL_VAR_SYMBOL);
2858#ifndef __U_BOOT__
2859 } else if (isdigit(ch)) {
2860 i = ch-'0'; /* XXX is $0 special? */
2861 if (i<global_argc) {
2862 parse_string(dest, ctx, global_argv[i]); /* recursion */
2863 }
2864 advance = 1;
2865#endif
2866 } else switch (ch) {
2867#ifndef __U_BOOT__
2868 case '$':
2869 b_adduint(dest,getpid());
2870 advance = 1;
2871 break;
2872 case '!':
2873 if (last_bg_pid > 0) b_adduint(dest, last_bg_pid);
2874 advance = 1;
2875 break;
2876#endif
2877 case '?':
wdenkc26e4542004-04-18 10:13:26 +00002878#ifndef __U_BOOT__
wdenkfe8c2802002-11-03 00:38:21 +00002879 b_adduint(dest,last_return_code);
wdenkc26e4542004-04-18 10:13:26 +00002880#else
2881 ctx->child->sp++;
2882 b_addchr(dest, SPECIAL_VAR_SYMBOL);
2883 b_addchr(dest, '$');
2884 b_addchr(dest, '?');
2885 b_addchr(dest, SPECIAL_VAR_SYMBOL);
2886#endif
wdenkfe8c2802002-11-03 00:38:21 +00002887 advance = 1;
2888 break;
2889#ifndef __U_BOOT__
2890 case '#':
2891 b_adduint(dest,global_argc ? global_argc-1 : 0);
2892 advance = 1;
2893 break;
2894#endif
2895 case '{':
2896 b_addchr(dest, SPECIAL_VAR_SYMBOL);
2897 ctx->child->sp++;
2898 b_getch(input);
2899 /* XXX maybe someone will try to escape the '}' */
2900 while(ch=b_getch(input),ch!=EOF && ch!='}') {
2901 b_addchr(dest,ch);
2902 }
2903 if (ch != '}') {
2904 syntax();
2905 return 1;
2906 }
2907 b_addchr(dest, SPECIAL_VAR_SYMBOL);
2908 break;
2909#ifndef __U_BOOT__
2910 case '(':
2911 b_getch(input);
2912 process_command_subs(dest, ctx, input, ')');
2913 break;
2914 case '*':
2915 sep[0]=ifs[0];
2916 for (i=1; i<global_argc; i++) {
2917 parse_string(dest, ctx, global_argv[i]);
2918 if (i+1 < global_argc) parse_string(dest, ctx, sep);
2919 }
2920 break;
2921 case '@':
2922 case '-':
2923 case '_':
2924 /* still unhandled, but should be eventually */
2925 error_msg("unhandled syntax: $%c",ch);
2926 return 1;
2927 break;
2928#endif
2929 default:
2930 b_addqchr(dest,'$',dest->quote);
2931 }
2932 /* Eat the character if the flag was set. If the compiler
2933 * is smart enough, we could substitute "b_getch(input);"
2934 * for all the "advance = 1;" above, and also end up with
2935 * a nice size-optimized program. Hah! That'll be the day.
2936 */
2937 if (advance) b_getch(input);
2938 return 0;
2939}
2940
2941#ifndef __U_BOOT__
2942int parse_string(o_string *dest, struct p_context *ctx, const char *src)
2943{
2944 struct in_str foo;
2945 setup_string_in_str(&foo, src);
2946 return parse_stream(dest, ctx, &foo, '\0');
2947}
2948#endif
2949
2950/* return code is 0 for normal exit, 1 for syntax error */
Kim Phillips199adb62012-10-29 13:34:32 +00002951static int parse_stream(o_string *dest, struct p_context *ctx,
2952 struct in_str *input, int end_trigger)
wdenkfe8c2802002-11-03 00:38:21 +00002953{
2954 unsigned int ch, m;
2955#ifndef __U_BOOT__
2956 int redir_fd;
2957 redir_type redir_style;
2958#endif
2959 int next;
2960
2961 /* Only double-quote state is handled in the state variable dest->quote.
2962 * A single-quote triggers a bypass of the main loop until its mate is
2963 * found. When recursing, quote state is passed in via dest->quote. */
2964
2965 debug_printf("parse_stream, end_trigger=%d\n",end_trigger);
2966 while ((ch=b_getch(input))!=EOF) {
2967 m = map[ch];
2968#ifdef __U_BOOT__
2969 if (input->__promptme == 0) return 1;
2970#endif
2971 next = (ch == '\n') ? 0 : b_peek(input);
wdenkc26e4542004-04-18 10:13:26 +00002972
2973 debug_printf("parse_stream: ch=%c (%d) m=%d quote=%d - %c\n",
2974 ch >= ' ' ? ch : '.', ch, m,
2975 dest->quote, ctx->stack == NULL ? '*' : '.');
2976
wdenkfe8c2802002-11-03 00:38:21 +00002977 if (m==0 || ((m==1 || m==2) && dest->quote)) {
2978 b_addqchr(dest, ch, dest->quote);
2979 } else {
2980 if (m==2) { /* unquoted IFS */
2981 if (done_word(dest, ctx)) {
2982 return 1;
2983 }
2984 /* If we aren't performing a substitution, treat a newline as a
2985 * command separator. */
2986 if (end_trigger != '\0' && ch=='\n')
2987 done_pipe(ctx,PIPE_SEQ);
2988 }
2989 if (ch == end_trigger && !dest->quote && ctx->w==RES_NONE) {
2990 debug_printf("leaving parse_stream (triggered)\n");
2991 return 0;
2992 }
2993#if 0
2994 if (ch=='\n') {
2995 /* Yahoo! Time to run with it! */
2996 done_pipe(ctx,PIPE_SEQ);
2997 run_list(ctx->list_head);
2998 initialize_context(ctx);
2999 }
3000#endif
3001 if (m!=2) switch (ch) {
3002 case '#':
3003 if (dest->length == 0 && !dest->quote) {
3004 while(ch=b_peek(input),ch!=EOF && ch!='\n') { b_getch(input); }
3005 } else {
3006 b_addqchr(dest, ch, dest->quote);
3007 }
3008 break;
3009 case '\\':
3010 if (next == EOF) {
3011 syntax();
3012 return 1;
3013 }
3014 b_addqchr(dest, '\\', dest->quote);
3015 b_addqchr(dest, b_getch(input), dest->quote);
3016 break;
3017 case '$':
3018 if (handle_dollar(dest, ctx, input)!=0) return 1;
3019 break;
3020 case '\'':
3021 dest->nonnull = 1;
3022 while(ch=b_getch(input),ch!=EOF && ch!='\'') {
3023#ifdef __U_BOOT__
3024 if(input->__promptme == 0) return 1;
3025#endif
3026 b_addchr(dest,ch);
3027 }
3028 if (ch==EOF) {
3029 syntax();
3030 return 1;
3031 }
3032 break;
3033 case '"':
3034 dest->nonnull = 1;
3035 dest->quote = !dest->quote;
3036 break;
3037#ifndef __U_BOOT__
3038 case '`':
3039 process_command_subs(dest, ctx, input, '`');
3040 break;
3041 case '>':
3042 redir_fd = redirect_opt_num(dest);
3043 done_word(dest, ctx);
3044 redir_style=REDIRECT_OVERWRITE;
3045 if (next == '>') {
3046 redir_style=REDIRECT_APPEND;
3047 b_getch(input);
3048 } else if (next == '(') {
3049 syntax(); /* until we support >(list) Process Substitution */
3050 return 1;
3051 }
3052 setup_redirect(ctx, redir_fd, redir_style, input);
3053 break;
3054 case '<':
3055 redir_fd = redirect_opt_num(dest);
3056 done_word(dest, ctx);
3057 redir_style=REDIRECT_INPUT;
3058 if (next == '<') {
3059 redir_style=REDIRECT_HEREIS;
3060 b_getch(input);
3061 } else if (next == '>') {
3062 redir_style=REDIRECT_IO;
3063 b_getch(input);
3064 } else if (next == '(') {
3065 syntax(); /* until we support <(list) Process Substitution */
3066 return 1;
3067 }
3068 setup_redirect(ctx, redir_fd, redir_style, input);
3069 break;
3070#endif
3071 case ';':
3072 done_word(dest, ctx);
3073 done_pipe(ctx,PIPE_SEQ);
3074 break;
3075 case '&':
3076 done_word(dest, ctx);
3077 if (next=='&') {
3078 b_getch(input);
3079 done_pipe(ctx,PIPE_AND);
3080 } else {
3081#ifndef __U_BOOT__
3082 done_pipe(ctx,PIPE_BG);
3083#else
3084 syntax_err();
3085 return 1;
3086#endif
3087 }
3088 break;
3089 case '|':
3090 done_word(dest, ctx);
3091 if (next=='|') {
3092 b_getch(input);
3093 done_pipe(ctx,PIPE_OR);
3094 } else {
3095 /* we could pick up a file descriptor choice here
3096 * with redirect_opt_num(), but bash doesn't do it.
3097 * "echo foo 2| cat" yields "foo 2". */
3098#ifndef __U_BOOT__
3099 done_command(ctx);
3100#else
3101 syntax_err();
3102 return 1;
3103#endif
3104 }
3105 break;
3106#ifndef __U_BOOT__
3107 case '(':
3108 case '{':
3109 if (parse_group(dest, ctx, input, ch)!=0) return 1;
3110 break;
3111 case ')':
3112 case '}':
3113 syntax(); /* Proper use of this character caught by end_trigger */
3114 return 1;
3115 break;
3116#endif
Joe Hershbergera005f192012-08-17 10:26:30 +00003117 case SUBSTED_VAR_SYMBOL:
3118 dest->nonnull = 1;
3119 while (ch = b_getch(input), ch != EOF &&
3120 ch != SUBSTED_VAR_SYMBOL) {
3121 debug_printf("subst, pass=%d\n", ch);
3122 if (input->__promptme == 0)
3123 return 1;
3124 b_addchr(dest, ch);
3125 }
3126 debug_printf("subst, term=%d\n", ch);
3127 if (ch == EOF) {
3128 syntax();
3129 return 1;
3130 }
3131 break;
wdenkfe8c2802002-11-03 00:38:21 +00003132 default:
3133 syntax(); /* this is really an internal logic error */
3134 return 1;
3135 }
3136 }
3137 }
3138 /* complain if quote? No, maybe we just finished a command substitution
3139 * that was quoted. Example:
3140 * $ echo "`cat foo` plus more"
3141 * and we just got the EOF generated by the subshell that ran "cat foo"
3142 * The only real complaint is if we got an EOF when end_trigger != '\0',
3143 * that is, we were really supposed to get end_trigger, and never got
3144 * one before the EOF. Can't use the standard "syntax error" return code,
3145 * so that parse_stream_outer can distinguish the EOF and exit smoothly. */
3146 debug_printf("leaving parse_stream (EOF)\n");
3147 if (end_trigger != '\0') return -1;
3148 return 0;
3149}
3150
Kim Phillips199adb62012-10-29 13:34:32 +00003151static void mapset(const unsigned char *set, int code)
wdenkfe8c2802002-11-03 00:38:21 +00003152{
3153 const unsigned char *s;
3154 for (s=set; *s; s++) map[*s] = code;
3155}
3156
Kim Phillips199adb62012-10-29 13:34:32 +00003157static void update_ifs_map(void)
wdenkfe8c2802002-11-03 00:38:21 +00003158{
3159 /* char *ifs and char map[256] are both globals. */
Wolfgang Denk77ddac92005-10-13 16:45:02 +02003160 ifs = (uchar *)getenv("IFS");
3161 if (ifs == NULL) ifs=(uchar *)" \t\n";
wdenkfe8c2802002-11-03 00:38:21 +00003162 /* Precompute a list of 'flow through' behavior so it can be treated
3163 * quickly up front. Computation is necessary because of IFS.
3164 * Special case handling of IFS == " \t\n" is not implemented.
3165 * The map[] array only really needs two bits each, and on most machines
3166 * that would be faster because of the reduced L1 cache footprint.
3167 */
3168 memset(map,0,sizeof(map)); /* most characters flow through always */
3169#ifndef __U_BOOT__
Wolfgang Denk77ddac92005-10-13 16:45:02 +02003170 mapset((uchar *)"\\$'\"`", 3); /* never flow through */
3171 mapset((uchar *)"<>;&|(){}#", 1); /* flow through if quoted */
wdenkfe8c2802002-11-03 00:38:21 +00003172#else
Joe Hershbergera005f192012-08-17 10:26:30 +00003173 {
3174 uchar subst[2] = {SUBSTED_VAR_SYMBOL, 0};
3175 mapset(subst, 3); /* never flow through */
3176 }
Wolfgang Denk77ddac92005-10-13 16:45:02 +02003177 mapset((uchar *)"\\$'\"", 3); /* never flow through */
3178 mapset((uchar *)";&|#", 1); /* flow through if quoted */
wdenkfe8c2802002-11-03 00:38:21 +00003179#endif
3180 mapset(ifs, 2); /* also flow through if quoted */
3181}
3182
3183/* most recursion does not come through here, the exeception is
3184 * from builtin_source() */
Kim Phillips199adb62012-10-29 13:34:32 +00003185static int parse_stream_outer(struct in_str *inp, int flag)
wdenkfe8c2802002-11-03 00:38:21 +00003186{
3187
3188 struct p_context ctx;
3189 o_string temp=NULL_O_STRING;
3190 int rcode;
3191#ifdef __U_BOOT__
Rabin Vincent2302b3a2014-10-29 23:21:41 +01003192 int code = 1;
wdenkfe8c2802002-11-03 00:38:21 +00003193#endif
3194 do {
3195 ctx.type = flag;
3196 initialize_context(&ctx);
3197 update_ifs_map();
Wolfgang Denk77ddac92005-10-13 16:45:02 +02003198 if (!(flag & FLAG_PARSE_SEMICOLON) || (flag & FLAG_REPARSING)) mapset((uchar *)";$&|", 0);
wdenkfe8c2802002-11-03 00:38:21 +00003199 inp->promptmode=1;
Simon Glass87b63982014-10-07 13:59:43 -06003200 rcode = parse_stream(&temp, &ctx, inp,
3201 flag & FLAG_CONT_ON_NEWLINE ? -1 : '\n');
wdenkfe8c2802002-11-03 00:38:21 +00003202#ifdef __U_BOOT__
3203 if (rcode == 1) flag_repeat = 0;
3204#endif
3205 if (rcode != 1 && ctx.old_flag != 0) {
3206 syntax();
3207#ifdef __U_BOOT__
3208 flag_repeat = 0;
3209#endif
3210 }
3211 if (rcode != 1 && ctx.old_flag == 0) {
3212 done_word(&temp, &ctx);
3213 done_pipe(&ctx,PIPE_SEQ);
3214#ifndef __U_BOOT__
3215 run_list(ctx.list_head);
3216#else
wdenkc26e4542004-04-18 10:13:26 +00003217 code = run_list(ctx.list_head);
3218 if (code == -2) { /* exit */
3219 b_free(&temp);
3220 code = 0;
3221 /* XXX hackish way to not allow exit from main loop */
3222 if (inp->peek == file_peek) {
3223 printf("exit not allowed from main input shell.\n");
3224 continue;
3225 }
3226 break;
3227 }
3228 if (code == -1)
wdenkfe8c2802002-11-03 00:38:21 +00003229 flag_repeat = 0;
3230#endif
3231 } else {
3232 if (ctx.old_flag != 0) {
3233 free(ctx.stack);
3234 b_reset(&temp);
3235 }
3236#ifdef __U_BOOT__
3237 if (inp->__promptme == 0) printf("<INTERRUPT>\n");
3238 inp->__promptme = 1;
3239#endif
3240 temp.nonnull = 0;
3241 temp.quote = 0;
3242 inp->p = NULL;
3243 free_pipe_list(ctx.list_head,0);
3244 }
3245 b_free(&temp);
Simon Glass587e1d42014-05-30 14:41:50 -06003246 /* loop on syntax errors, return on EOF */
Rabin Vincentf3a05c82014-11-21 23:05:22 +01003247 } while (rcode != -1 && !(flag & FLAG_EXIT_FROM_LOOP) &&
Simon Glass587e1d42014-05-30 14:41:50 -06003248 (inp->peek != static_peek || b_peek(inp)));
wdenkfe8c2802002-11-03 00:38:21 +00003249#ifndef __U_BOOT__
3250 return 0;
3251#else
3252 return (code != 0) ? 1 : 0;
3253#endif /* __U_BOOT__ */
3254}
3255
3256#ifndef __U_BOOT__
3257static int parse_string_outer(const char *s, int flag)
3258#else
Jason Hobbsc8a20792011-08-31 05:37:24 +00003259int parse_string_outer(const char *s, int flag)
wdenkfe8c2802002-11-03 00:38:21 +00003260#endif /* __U_BOOT__ */
3261{
3262 struct in_str input;
3263#ifdef __U_BOOT__
3264 char *p = NULL;
3265 int rcode;
Rabin Vincent484408f2014-10-29 23:21:39 +01003266 if (!s)
wdenkfe8c2802002-11-03 00:38:21 +00003267 return 1;
Rabin Vincent484408f2014-10-29 23:21:39 +01003268 if (!*s)
3269 return 0;
wdenkfe8c2802002-11-03 00:38:21 +00003270 if (!(p = strchr(s, '\n')) || *++p) {
3271 p = xmalloc(strlen(s) + 2);
3272 strcpy(p, s);
3273 strcat(p, "\n");
3274 setup_string_in_str(&input, p);
3275 rcode = parse_stream_outer(&input, flag);
3276 free(p);
3277 return rcode;
3278 } else {
3279#endif
3280 setup_string_in_str(&input, s);
3281 return parse_stream_outer(&input, flag);
3282#ifdef __U_BOOT__
3283 }
3284#endif
3285}
3286
3287#ifndef __U_BOOT__
3288static int parse_file_outer(FILE *f)
3289#else
3290int parse_file_outer(void)
3291#endif
3292{
3293 int rcode;
3294 struct in_str input;
3295#ifndef __U_BOOT__
3296 setup_file_in_str(&input, f);
3297#else
3298 setup_file_in_str(&input);
3299#endif
3300 rcode = parse_stream_outer(&input, FLAG_PARSE_SEMICOLON);
3301 return rcode;
3302}
3303
3304#ifdef __U_BOOT__
Wolfgang Denk2e5167c2010-10-28 20:00:11 +02003305#ifdef CONFIG_NEEDS_MANUAL_RELOC
wdenk3e386912003-04-05 00:53:31 +00003306static void u_boot_hush_reloc(void)
3307{
wdenk3e386912003-04-05 00:53:31 +00003308 unsigned long addr;
3309 struct reserved_combo *r;
3310
3311 for (r=reserved_list; r<reserved_list+NRES; r++) {
3312 addr = (ulong) (r->literal) + gd->reloc_off;
3313 r->literal = (char *)addr;
3314 }
3315}
Peter Tyser521af042009-09-21 11:20:36 -05003316#endif
wdenk3e386912003-04-05 00:53:31 +00003317
wdenkfe8c2802002-11-03 00:38:21 +00003318int u_boot_hush_start(void)
3319{
wdenk2d5b5612003-10-14 19:43:55 +00003320 if (top_vars == NULL) {
3321 top_vars = malloc(sizeof(struct variables));
3322 top_vars->name = "HUSH_VERSION";
3323 top_vars->value = "0.01";
Kim Phillips199adb62012-10-29 13:34:32 +00003324 top_vars->next = NULL;
wdenk2d5b5612003-10-14 19:43:55 +00003325 top_vars->flg_export = 0;
3326 top_vars->flg_read_only = 1;
Wolfgang Denk2e5167c2010-10-28 20:00:11 +02003327#ifdef CONFIG_NEEDS_MANUAL_RELOC
wdenk2d5b5612003-10-14 19:43:55 +00003328 u_boot_hush_reloc();
Peter Tyser521af042009-09-21 11:20:36 -05003329#endif
wdenk2d5b5612003-10-14 19:43:55 +00003330 }
wdenkfe8c2802002-11-03 00:38:21 +00003331 return 0;
3332}
3333
3334static void *xmalloc(size_t size)
3335{
3336 void *p = NULL;
3337
3338 if (!(p = malloc(size))) {
3339 printf("ERROR : memory not allocated\n");
3340 for(;;);
3341 }
3342 return p;
3343}
3344
3345static void *xrealloc(void *ptr, size_t size)
3346{
3347 void *p = NULL;
3348
3349 if (!(p = realloc(ptr, size))) {
3350 printf("ERROR : memory not allocated\n");
3351 for(;;);
3352 }
3353 return p;
3354}
3355#endif /* __U_BOOT__ */
3356
3357#ifndef __U_BOOT__
3358/* Make sure we have a controlling tty. If we get started under a job
3359 * aware app (like bash for example), make sure we are now in charge so
3360 * we don't fight over who gets the foreground */
wdenkd0fb80c2003-01-11 09:48:40 +00003361static void setup_job_control(void)
wdenkfe8c2802002-11-03 00:38:21 +00003362{
3363 static pid_t shell_pgrp;
3364 /* Loop until we are in the foreground. */
3365 while (tcgetpgrp (shell_terminal) != (shell_pgrp = getpgrp ()))
3366 kill (- shell_pgrp, SIGTTIN);
3367
3368 /* Ignore interactive and job-control signals. */
3369 signal(SIGINT, SIG_IGN);
3370 signal(SIGQUIT, SIG_IGN);
3371 signal(SIGTERM, SIG_IGN);
3372 signal(SIGTSTP, SIG_IGN);
3373 signal(SIGTTIN, SIG_IGN);
3374 signal(SIGTTOU, SIG_IGN);
3375 signal(SIGCHLD, SIG_IGN);
3376
3377 /* Put ourselves in our own process group. */
3378 setsid();
3379 shell_pgrp = getpid ();
3380 setpgid (shell_pgrp, shell_pgrp);
3381
3382 /* Grab control of the terminal. */
3383 tcsetpgrp(shell_terminal, shell_pgrp);
3384}
3385
Wolfgang Denk54841ab2010-06-28 22:00:46 +02003386int hush_main(int argc, char * const *argv)
wdenkfe8c2802002-11-03 00:38:21 +00003387{
3388 int opt;
3389 FILE *input;
3390 char **e = environ;
3391
3392 /* XXX what should these be while sourcing /etc/profile? */
3393 global_argc = argc;
3394 global_argv = argv;
3395
3396 /* (re?) initialize globals. Sometimes hush_main() ends up calling
3397 * hush_main(), therefore we cannot rely on the BSS to zero out this
3398 * stuff. Reset these to 0 every time. */
3399 ifs = NULL;
3400 /* map[] is taken care of with call to update_ifs_map() */
3401 fake_mode = 0;
3402 interactive = 0;
3403 close_me_head = NULL;
3404 last_bg_pid = 0;
3405 job_list = NULL;
3406 last_jobid = 0;
3407
3408 /* Initialize some more globals to non-zero values */
3409 set_cwd();
wdenkd0fb80c2003-01-11 09:48:40 +00003410#ifdef CONFIG_FEATURE_COMMAND_EDITING
wdenkfe8c2802002-11-03 00:38:21 +00003411 cmdedit_set_initial_prompt();
3412#else
3413 PS1 = NULL;
3414#endif
3415 PS2 = "> ";
3416
3417 /* initialize our shell local variables with the values
3418 * currently living in the environment */
3419 if (e) {
3420 for (; *e; e++)
3421 set_local_var(*e, 2); /* without call putenv() */
3422 }
3423
3424 last_return_code=EXIT_SUCCESS;
3425
3426
3427 if (argv[0] && argv[0][0] == '-') {
3428 debug_printf("\nsourcing /etc/profile\n");
3429 if ((input = fopen("/etc/profile", "r")) != NULL) {
3430 mark_open(fileno(input));
3431 parse_file_outer(input);
3432 mark_closed(fileno(input));
3433 fclose(input);
3434 }
3435 }
3436 input=stdin;
3437
3438 while ((opt = getopt(argc, argv, "c:xif")) > 0) {
3439 switch (opt) {
3440 case 'c':
3441 {
3442 global_argv = argv+optind;
3443 global_argc = argc-optind;
3444 opt = parse_string_outer(optarg, FLAG_PARSE_SEMICOLON);
3445 goto final_return;
3446 }
3447 break;
3448 case 'i':
3449 interactive++;
3450 break;
3451 case 'f':
3452 fake_mode++;
3453 break;
3454 default:
3455#ifndef BB_VER
3456 fprintf(stderr, "Usage: sh [FILE]...\n"
3457 " or: sh -c command [args]...\n\n");
3458 exit(EXIT_FAILURE);
3459#else
3460 show_usage();
3461#endif
3462 }
3463 }
3464 /* A shell is interactive if the `-i' flag was given, or if all of
3465 * the following conditions are met:
3466 * no -c command
3467 * no arguments remaining or the -s flag given
3468 * standard input is a terminal
3469 * standard output is a terminal
3470 * Refer to Posix.2, the description of the `sh' utility. */
3471 if (argv[optind]==NULL && input==stdin &&
3472 isatty(fileno(stdin)) && isatty(fileno(stdout))) {
3473 interactive++;
3474 }
3475
3476 debug_printf("\ninteractive=%d\n", interactive);
3477 if (interactive) {
3478 /* Looks like they want an interactive shell */
wdenk8bde7f72003-06-27 21:31:46 +00003479#ifndef CONFIG_FEATURE_SH_EXTRA_QUIET
wdenkd0fb80c2003-01-11 09:48:40 +00003480 printf( "\n\n" BB_BANNER " hush - the humble shell v0.01 (testing)\n");
3481 printf( "Enter 'help' for a list of built-in commands.\n\n");
3482#endif
wdenkfe8c2802002-11-03 00:38:21 +00003483 setup_job_control();
3484 }
3485
3486 if (argv[optind]==NULL) {
3487 opt=parse_file_outer(stdin);
3488 goto final_return;
3489 }
3490
3491 debug_printf("\nrunning script '%s'\n", argv[optind]);
3492 global_argv = argv+optind;
3493 global_argc = argc-optind;
3494 input = xfopen(argv[optind], "r");
3495 opt = parse_file_outer(input);
3496
wdenkd0fb80c2003-01-11 09:48:40 +00003497#ifdef CONFIG_FEATURE_CLEAN_UP
wdenkfe8c2802002-11-03 00:38:21 +00003498 fclose(input);
3499 if (cwd && cwd != unknown)
3500 free((char*)cwd);
3501 {
3502 struct variables *cur, *tmp;
3503 for(cur = top_vars; cur; cur = tmp) {
3504 tmp = cur->next;
3505 if (!cur->flg_read_only) {
3506 free(cur->name);
3507 free(cur->value);
3508 free(cur);
3509 }
3510 }
3511 }
3512#endif
3513
3514final_return:
3515 return(opt?opt:last_return_code);
3516}
3517#endif
3518
3519static char *insert_var_value(char *inp)
3520{
Joe Hershbergera005f192012-08-17 10:26:30 +00003521 return insert_var_value_sub(inp, 0);
3522}
3523
3524static char *insert_var_value_sub(char *inp, int tag_subst)
3525{
wdenkfe8c2802002-11-03 00:38:21 +00003526 int res_str_len = 0;
3527 int len;
3528 int done = 0;
3529 char *p, *p1, *res_str = NULL;
3530
3531 while ((p = strchr(inp, SPECIAL_VAR_SYMBOL))) {
Nishanth Menon8405b8d2015-12-04 13:02:11 -06003532 /* check the beginning of the string for normal characters */
wdenkfe8c2802002-11-03 00:38:21 +00003533 if (p != inp) {
Nishanth Menon8405b8d2015-12-04 13:02:11 -06003534 /* copy any characters to the result string */
wdenkfe8c2802002-11-03 00:38:21 +00003535 len = p - inp;
3536 res_str = xrealloc(res_str, (res_str_len + len));
3537 strncpy((res_str + res_str_len), inp, len);
3538 res_str_len += len;
3539 }
3540 inp = ++p;
Joe Hershbergera005f192012-08-17 10:26:30 +00003541 /* find the ending marker */
wdenkfe8c2802002-11-03 00:38:21 +00003542 p = strchr(inp, SPECIAL_VAR_SYMBOL);
3543 *p = '\0';
Joe Hershbergera005f192012-08-17 10:26:30 +00003544 /* look up the value to substitute */
wdenkfe8c2802002-11-03 00:38:21 +00003545 if ((p1 = lookup_param(inp))) {
Joe Hershbergera005f192012-08-17 10:26:30 +00003546 if (tag_subst)
3547 len = res_str_len + strlen(p1) + 2;
3548 else
3549 len = res_str_len + strlen(p1);
wdenkfe8c2802002-11-03 00:38:21 +00003550 res_str = xrealloc(res_str, (1 + len));
Joe Hershbergera005f192012-08-17 10:26:30 +00003551 if (tag_subst) {
3552 /*
3553 * copy the variable value to the result
3554 * string
3555 */
3556 strcpy((res_str + res_str_len + 1), p1);
3557
3558 /*
3559 * mark the replaced text to be accepted as
3560 * is
3561 */
3562 res_str[res_str_len] = SUBSTED_VAR_SYMBOL;
3563 res_str[res_str_len + 1 + strlen(p1)] =
3564 SUBSTED_VAR_SYMBOL;
3565 } else
3566 /*
3567 * copy the variable value to the result
3568 * string
3569 */
3570 strcpy((res_str + res_str_len), p1);
3571
wdenkfe8c2802002-11-03 00:38:21 +00003572 res_str_len = len;
3573 }
3574 *p = SPECIAL_VAR_SYMBOL;
3575 inp = ++p;
3576 done = 1;
3577 }
3578 if (done) {
3579 res_str = xrealloc(res_str, (1 + res_str_len + strlen(inp)));
3580 strcpy((res_str + res_str_len), inp);
3581 while ((p = strchr(res_str, '\n'))) {
3582 *p = ' ';
3583 }
3584 }
3585 return (res_str == NULL) ? inp : res_str;
3586}
3587
3588static char **make_list_in(char **inp, char *name)
3589{
3590 int len, i;
3591 int name_len = strlen(name);
3592 int n = 0;
3593 char **list;
3594 char *p1, *p2, *p3;
3595
3596 /* create list of variable values */
3597 list = xmalloc(sizeof(*list));
3598 for (i = 0; inp[i]; i++) {
3599 p3 = insert_var_value(inp[i]);
3600 p1 = p3;
3601 while (*p1) {
Jeroen Hofstee930e4252014-06-11 00:28:47 +02003602 if (*p1 == ' ') {
wdenkfe8c2802002-11-03 00:38:21 +00003603 p1++;
3604 continue;
3605 }
3606 if ((p2 = strchr(p1, ' '))) {
3607 len = p2 - p1;
3608 } else {
3609 len = strlen(p1);
3610 p2 = p1 + len;
3611 }
3612 /* we use n + 2 in realloc for list,because we add
3613 * new element and then we will add NULL element */
3614 list = xrealloc(list, sizeof(*list) * (n + 2));
3615 list[n] = xmalloc(2 + name_len + len);
3616 strcpy(list[n], name);
3617 strcat(list[n], "=");
3618 strncat(list[n], p1, len);
3619 list[n++][name_len + len + 1] = '\0';
3620 p1 = p2;
3621 }
3622 if (p3 != inp[i]) free(p3);
3623 }
3624 list[n] = NULL;
3625 return list;
3626}
3627
Stephen Warrenfe9ca3d2014-03-01 22:16:10 -07003628/*
3629 * Make new string for parser
3630 * inp - array of argument strings to flatten
3631 * nonnull - indicates argument was quoted when originally parsed
3632 */
3633static char *make_string(char **inp, int *nonnull)
wdenkfe8c2802002-11-03 00:38:21 +00003634{
3635 char *p;
3636 char *str = NULL;
3637 int n;
3638 int len = 2;
Joe Hershbergera005f192012-08-17 10:26:30 +00003639 char *noeval_str;
3640 int noeval = 0;
wdenkfe8c2802002-11-03 00:38:21 +00003641
Joe Hershbergera005f192012-08-17 10:26:30 +00003642 noeval_str = get_local_var("HUSH_NO_EVAL");
3643 if (noeval_str != NULL && *noeval_str != '0' && *noeval_str != '\0')
3644 noeval = 1;
wdenkfe8c2802002-11-03 00:38:21 +00003645 for (n = 0; inp[n]; n++) {
Joe Hershbergera005f192012-08-17 10:26:30 +00003646 p = insert_var_value_sub(inp[n], noeval);
Stephen Warrenfe9ca3d2014-03-01 22:16:10 -07003647 str = xrealloc(str, (len + strlen(p) + (2 * nonnull[n])));
wdenkfe8c2802002-11-03 00:38:21 +00003648 if (n) {
3649 strcat(str, " ");
3650 } else {
3651 *str = '\0';
3652 }
Stephen Warrenfe9ca3d2014-03-01 22:16:10 -07003653 if (nonnull[n])
3654 strcat(str, "'");
wdenkfe8c2802002-11-03 00:38:21 +00003655 strcat(str, p);
Stephen Warrenfe9ca3d2014-03-01 22:16:10 -07003656 if (nonnull[n])
3657 strcat(str, "'");
wdenkfe8c2802002-11-03 00:38:21 +00003658 len = strlen(str) + 3;
3659 if (p != inp[n]) free(p);
3660 }
3661 len = strlen(str);
3662 *(str + len) = '\n';
3663 *(str + len + 1) = '\0';
3664 return str;
3665}
3666
Heiko Schocher81473f62008-10-15 09:40:28 +02003667#ifdef __U_BOOT__
Kim Phillips199adb62012-10-29 13:34:32 +00003668static int do_showvar(cmd_tbl_t *cmdtp, int flag, int argc,
3669 char * const argv[])
Heiko Schocher81473f62008-10-15 09:40:28 +02003670{
3671 int i, k;
3672 int rcode = 0;
3673 struct variables *cur;
3674
3675 if (argc == 1) { /* Print all env variables */
3676 for (cur = top_vars; cur; cur = cur->next) {
3677 printf ("%s=%s\n", cur->name, cur->value);
3678 if (ctrlc ()) {
3679 puts ("\n ** Abort\n");
3680 return 1;
3681 }
3682 }
3683 return 0;
3684 }
3685 for (i = 1; i < argc; ++i) { /* print single env variables */
3686 char *name = argv[i];
3687
3688 k = -1;
3689 for (cur = top_vars; cur; cur = cur->next) {
3690 if(strcmp (cur->name, name) == 0) {
3691 k = 0;
3692 printf ("%s=%s\n", cur->name, cur->value);
3693 }
3694 if (ctrlc ()) {
3695 puts ("\n ** Abort\n");
3696 return 1;
3697 }
3698 }
3699 if (k < 0) {
3700 printf ("## Error: \"%s\" not defined\n", name);
3701 rcode ++;
3702 }
3703 }
3704 return rcode;
3705}
3706
3707U_BOOT_CMD(
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02003708 showvar, CONFIG_SYS_MAXARGS, 1, do_showvar,
Peter Tyser2fb26042009-01-27 18:03:12 -06003709 "print local hushshell variables",
Heiko Schocher81473f62008-10-15 09:40:28 +02003710 "\n - print values of all hushshell variables\n"
3711 "showvar name ...\n"
Wolfgang Denka89c33d2009-05-24 17:06:54 +02003712 " - print value of hushshell variable 'name'"
Heiko Schocher81473f62008-10-15 09:40:28 +02003713);
3714
3715#endif
wdenkfe8c2802002-11-03 00:38:21 +00003716/****************************************************************************/