source: MondoRescue/branches/3.2/mindi-busybox/libbb/appletlib.c@ 3232

Last change on this file since 3232 was 3232, checked in by Bruno Cornec, 10 years ago
  • Update mindi-busybox to 1.21.1
  • Property svn:eol-style set to native
File size: 21.9 KB
Line 
1/* vi: set sw=4 ts=4: */
2/*
3 * Utility routines.
4 *
5 * Copyright (C) tons of folks. Tracking down who wrote what
6 * isn't something I'm going to worry about... If you wrote something
7 * here, please feel free to acknowledge your work.
8 *
9 * Based in part on code from sash, Copyright (c) 1999 by David I. Bell
10 * Permission has been granted to redistribute this code under GPL.
11 *
12 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
13 */
14
15/* We are trying to not use printf, this benefits the case when selected
16 * applets are really simple. Example:
17 *
18 * $ ./busybox
19 * ...
20 * Currently defined functions:
21 * basename, false, true
22 *
23 * $ size busybox
24 * text data bss dec hex filename
25 * 4473 52 72 4597 11f5 busybox
26 *
27 * FEATURE_INSTALLER or FEATURE_SUID will still link printf routines in. :(
28 */
29#include "busybox.h"
30
31#if !(defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__NetBSD__) \
32 || defined(__APPLE__) \
33 )
34# include <malloc.h> /* for mallopt */
35#endif
36
37
38/* Declare <applet>_main() */
39#define PROTOTYPES
40#include "applets.h"
41#undef PROTOTYPES
42
43/* Include generated applet names, pointers to <applet>_main, etc */
44#include "applet_tables.h"
45/* ...and if applet_tables generator says we have only one applet... */
46#ifdef SINGLE_APPLET_MAIN
47# undef ENABLE_FEATURE_INDIVIDUAL
48# define ENABLE_FEATURE_INDIVIDUAL 1
49# undef IF_FEATURE_INDIVIDUAL
50# define IF_FEATURE_INDIVIDUAL(...) __VA_ARGS__
51#endif
52
53#include "usage_compressed.h"
54
55
56#if ENABLE_SHOW_USAGE && !ENABLE_FEATURE_COMPRESS_USAGE
57static const char usage_messages[] ALIGN1 = UNPACKED_USAGE;
58#else
59# define usage_messages 0
60#endif
61
62#if ENABLE_FEATURE_COMPRESS_USAGE
63
64static const char packed_usage[] ALIGN1 = { PACKED_USAGE };
65# include "bb_archive.h"
66static const char *unpack_usage_messages(void)
67{
68 char *outbuf = NULL;
69 bunzip_data *bd;
70 int i;
71
72 i = start_bunzip(&bd,
73 /* src_fd: */ -1,
74 /* inbuf: */ packed_usage,
75 /* len: */ sizeof(packed_usage));
76 /* read_bunzip can longjmp to start_bunzip, and ultimately
77 * end up here with i != 0 on read data errors! Not trivial */
78 if (!i) {
79 /* Cannot use xmalloc: will leak bd in NOFORK case! */
80 outbuf = malloc_or_warn(sizeof(UNPACKED_USAGE));
81 if (outbuf)
82 read_bunzip(bd, outbuf, sizeof(UNPACKED_USAGE));
83 }
84 dealloc_bunzip(bd);
85 return outbuf;
86}
87# define dealloc_usage_messages(s) free(s)
88
89#else
90
91# define unpack_usage_messages() usage_messages
92# define dealloc_usage_messages(s) ((void)(s))
93
94#endif /* FEATURE_COMPRESS_USAGE */
95
96
97void FAST_FUNC bb_show_usage(void)
98{
99 if (ENABLE_SHOW_USAGE) {
100#ifdef SINGLE_APPLET_STR
101 /* Imagine that this applet is "true". Dont suck in printf! */
102 const char *usage_string = unpack_usage_messages();
103
104 if (*usage_string == '\b') {
105 full_write2_str("No help available.\n\n");
106 } else {
107 full_write2_str("Usage: "SINGLE_APPLET_STR" ");
108 full_write2_str(usage_string);
109 full_write2_str("\n\n");
110 }
111 if (ENABLE_FEATURE_CLEAN_UP)
112 dealloc_usage_messages((char*)usage_string);
113#else
114 const char *p;
115 const char *usage_string = p = unpack_usage_messages();
116 int ap = find_applet_by_name(applet_name);
117
118 if (ap < 0) /* never happens, paranoia */
119 xfunc_die();
120 while (ap) {
121 while (*p++) continue;
122 ap--;
123 }
124 full_write2_str(bb_banner);
125 full_write2_str(" multi-call binary.\n");
126 if (*p == '\b')
127 full_write2_str("\nNo help available.\n\n");
128 else {
129 full_write2_str("\nUsage: ");
130 full_write2_str(applet_name);
131 full_write2_str(" ");
132 full_write2_str(p);
133 full_write2_str("\n\n");
134 }
135 if (ENABLE_FEATURE_CLEAN_UP)
136 dealloc_usage_messages((char*)usage_string);
137#endif
138 }
139 xfunc_die();
140}
141
142#if NUM_APPLETS > 8
143static int applet_name_compare(const void *name, const void *idx)
144{
145 int i = (int)(ptrdiff_t)idx - 1;
146 return strcmp(name, APPLET_NAME(i));
147}
148#endif
149int FAST_FUNC find_applet_by_name(const char *name)
150{
151#if NUM_APPLETS > 8
152 /* Do a binary search to find the applet entry given the name. */
153 const char *p;
154 p = bsearch(name, (void*)(ptrdiff_t)1, ARRAY_SIZE(applet_main), 1, applet_name_compare);
155 /*
156 * if (!p) return -1;
157 * ^^^^^^^^^^^^^^^^^^ the code below will do this if p == NULL :)
158 */
159 return (int)(ptrdiff_t)p - 1;
160#else
161 /* A version which does not pull in bsearch */
162 int i = 0;
163 const char *p = applet_names;
164 while (i < NUM_APPLETS) {
165 if (strcmp(name, p) == 0)
166 return i;
167 p += strlen(p) + 1;
168 i++;
169 }
170 return -1;
171#endif
172}
173
174
175void lbb_prepare(const char *applet
176 IF_FEATURE_INDIVIDUAL(, char **argv))
177 MAIN_EXTERNALLY_VISIBLE;
178void lbb_prepare(const char *applet
179 IF_FEATURE_INDIVIDUAL(, char **argv))
180{
181#ifdef __GLIBC__
182 (*(int **)&bb_errno) = __errno_location();
183 barrier();
184#endif
185 applet_name = applet;
186
187 /* Set locale for everybody except 'init' */
188 if (ENABLE_LOCALE_SUPPORT && getpid() != 1)
189 setlocale(LC_ALL, "");
190
191#if ENABLE_FEATURE_INDIVIDUAL
192 /* Redundant for busybox (run_applet_and_exit covers that case)
193 * but needed for "individual applet" mode */
194 if (argv[1]
195 && !argv[2]
196 && strcmp(argv[1], "--help") == 0
197 && strncmp(applet, "busybox", 7) != 0
198 ) {
199 /* Special case. POSIX says "test --help"
200 * should be no different from e.g. "test --foo". */
201 if (!ENABLE_TEST || strcmp(applet_name, "test") != 0)
202 bb_show_usage();
203 }
204#endif
205}
206
207/* The code below can well be in applets/applets.c, as it is used only
208 * for busybox binary, not "individual" binaries.
209 * However, keeping it here and linking it into libbusybox.so
210 * (together with remaining tiny applets/applets.o)
211 * makes it possible to avoid --whole-archive at link time.
212 * This makes (shared busybox) + libbusybox smaller.
213 * (--gc-sections would be even better....)
214 */
215
216const char *applet_name;
217#if !BB_MMU
218bool re_execed;
219#endif
220
221
222/* If not built as a single-applet executable... */
223#if !defined(SINGLE_APPLET_MAIN)
224
225IF_FEATURE_SUID(static uid_t ruid;) /* real uid */
226
227# if ENABLE_FEATURE_SUID_CONFIG
228
229static struct suid_config_t {
230 /* next ptr must be first: this struct needs to be llist-compatible */
231 struct suid_config_t *m_next;
232 struct bb_uidgid_t m_ugid;
233 int m_applet;
234 mode_t m_mode;
235} *suid_config;
236
237static bool suid_cfg_readable;
238
239/* check if u is member of group g */
240static int ingroup(uid_t u, gid_t g)
241{
242 struct group *grp = getgrgid(g);
243 if (grp) {
244 char **mem;
245 for (mem = grp->gr_mem; *mem; mem++) {
246 struct passwd *pwd = getpwnam(*mem);
247 if (pwd && (pwd->pw_uid == u))
248 return 1;
249 }
250 }
251 return 0;
252}
253
254/* libbb candidate */
255static char *get_trimmed_slice(char *s, char *e)
256{
257 /* First, consider the value at e to be nul and back up until we
258 * reach a non-space char. Set the char after that (possibly at
259 * the original e) to nul. */
260 while (e-- > s) {
261 if (!isspace(*e)) {
262 break;
263 }
264 }
265 e[1] = '\0';
266
267 /* Next, advance past all leading space and return a ptr to the
268 * first non-space char; possibly the terminating nul. */
269 return skip_whitespace(s);
270}
271
272static void parse_config_file(void)
273{
274 /* Don't depend on the tools to combine strings. */
275 static const char config_file[] ALIGN1 = "/etc/busybox.conf";
276
277 struct suid_config_t *sct_head;
278 int applet_no;
279 FILE *f;
280 const char *errmsg;
281 unsigned lc;
282 smallint section;
283 struct stat st;
284
285 ruid = getuid();
286 if (ruid == 0) /* run by root - don't need to even read config file */
287 return;
288
289 if ((stat(config_file, &st) != 0) /* No config file? */
290 || !S_ISREG(st.st_mode) /* Not a regular file? */
291 || (st.st_uid != 0) /* Not owned by root? */
292 || (st.st_mode & (S_IWGRP | S_IWOTH)) /* Writable by non-root? */
293 || !(f = fopen_for_read(config_file)) /* Cannot open? */
294 ) {
295 return;
296 }
297
298 suid_cfg_readable = 1;
299 sct_head = NULL;
300 section = lc = 0;
301
302 while (1) {
303 char buffer[256];
304 char *s;
305
306 if (!fgets(buffer, sizeof(buffer), f)) { /* Are we done? */
307 // Looks like bloat
308 //if (ferror(f)) { /* Make sure it wasn't a read error. */
309 // errmsg = "reading";
310 // goto pe_label;
311 //}
312 fclose(f);
313 suid_config = sct_head; /* Success, so set the pointer. */
314 return;
315 }
316
317 s = buffer;
318 lc++; /* Got a (partial) line. */
319
320 /* If a line is too long for our buffer, we consider it an error.
321 * The following test does mistreat one corner case though.
322 * If the final line of the file does not end with a newline and
323 * yet exactly fills the buffer, it will be treated as too long
324 * even though there isn't really a problem. But it isn't really
325 * worth adding code to deal with such an unlikely situation, and
326 * we do err on the side of caution. Besides, the line would be
327 * too long if it did end with a newline. */
328 if (!strchr(s, '\n') && !feof(f)) {
329 errmsg = "line too long";
330 goto pe_label;
331 }
332
333 /* Trim leading and trailing whitespace, ignoring comments, and
334 * check if the resulting string is empty. */
335 s = get_trimmed_slice(s, strchrnul(s, '#'));
336 if (!*s) {
337 continue;
338 }
339
340 /* Check for a section header. */
341
342 if (*s == '[') {
343 /* Unlike the old code, we ignore leading and trailing
344 * whitespace for the section name. We also require that
345 * there are no stray characters after the closing bracket. */
346 char *e = strchr(s, ']');
347 if (!e /* Missing right bracket? */
348 || e[1] /* Trailing characters? */
349 || !*(s = get_trimmed_slice(s+1, e)) /* Missing name? */
350 ) {
351 errmsg = "section header";
352 goto pe_label;
353 }
354 /* Right now we only have one section so just check it.
355 * If more sections are added in the future, please don't
356 * resort to cascading ifs with multiple strcasecmp calls.
357 * That kind of bloated code is all too common. A loop
358 * and a string table would be a better choice unless the
359 * number of sections is very small. */
360 if (strcasecmp(s, "SUID") == 0) {
361 section = 1;
362 continue;
363 }
364 section = -1; /* Unknown section so set to skip. */
365 continue;
366 }
367
368 /* Process sections. */
369
370 if (section == 1) { /* SUID */
371 /* Since we trimmed leading and trailing space above, we're
372 * now looking for strings of the form
373 * <key>[::space::]*=[::space::]*<value>
374 * where both key and value could contain inner whitespace. */
375
376 /* First get the key (an applet name in our case). */
377 char *e = strchr(s, '=');
378 if (e) {
379 s = get_trimmed_slice(s, e);
380 }
381 if (!e || !*s) { /* Missing '=' or empty key. */
382 errmsg = "keyword";
383 goto pe_label;
384 }
385
386 /* Ok, we have an applet name. Process the rhs if this
387 * applet is currently built in and ignore it otherwise.
388 * Note: this can hide config file bugs which only pop
389 * up when the busybox configuration is changed. */
390 applet_no = find_applet_by_name(s);
391 if (applet_no >= 0) {
392 unsigned i;
393 struct suid_config_t *sct;
394
395 /* Note: We currently don't check for duplicates!
396 * The last config line for each applet will be the
397 * one used since we insert at the head of the list.
398 * I suppose this could be considered a feature. */
399 sct = xzalloc(sizeof(*sct));
400 sct->m_applet = applet_no;
401 /*sct->m_mode = 0;*/
402 sct->m_next = sct_head;
403 sct_head = sct;
404
405 /* Get the specified mode. */
406
407 e = skip_whitespace(e+1);
408
409 for (i = 0; i < 3; i++) {
410 /* There are 4 chars for each of user/group/other.
411 * "x-xx" instead of "x-" are to make
412 * "idx > 3" check catch invalid chars.
413 */
414 static const char mode_chars[] ALIGN1 = "Ssx-" "Ssx-" "x-xx";
415 static const unsigned short mode_mask[] ALIGN2 = {
416 S_ISUID, S_ISUID|S_IXUSR, S_IXUSR, 0, /* Ssx- */
417 S_ISGID, S_ISGID|S_IXGRP, S_IXGRP, 0, /* Ssx- */
418 S_IXOTH, 0 /* x- */
419 };
420 const char *q = strchrnul(mode_chars + 4*i, *e);
421 unsigned idx = q - (mode_chars + 4*i);
422 if (idx > 3) {
423 errmsg = "mode";
424 goto pe_label;
425 }
426 sct->m_mode |= mode_mask[q - mode_chars];
427 e++;
428 }
429
430 /* Now get the user/group info. */
431
432 s = skip_whitespace(e);
433 /* Default is 0.0, else parse USER.GROUP: */
434 if (*s) {
435 /* We require whitespace between mode and USER.GROUP */
436 if ((s == e) || !(e = strchr(s, '.'))) {
437 errmsg = "uid.gid";
438 goto pe_label;
439 }
440 *e = ':'; /* get_uidgid needs USER:GROUP syntax */
441 if (get_uidgid(&sct->m_ugid, s, /*allow_numeric:*/ 1) == 0) {
442 errmsg = "unknown user/group";
443 goto pe_label;
444 }
445 }
446 }
447 continue;
448 }
449
450 /* Unknown sections are ignored. */
451
452 /* Encountering configuration lines prior to seeing a
453 * section header is treated as an error. This is how
454 * the old code worked, but it may not be desirable.
455 * We may want to simply ignore such lines in case they
456 * are used in some future version of busybox. */
457 if (!section) {
458 errmsg = "keyword outside section";
459 goto pe_label;
460 }
461
462 } /* while (1) */
463
464 pe_label:
465 fclose(f);
466 bb_error_msg("parse error in %s, line %u: %s", config_file, lc, errmsg);
467
468 /* Release any allocated memory before returning. */
469 llist_free((llist_t*)sct_head, NULL);
470}
471# else
472static inline void parse_config_file(void)
473{
474 IF_FEATURE_SUID(ruid = getuid();)
475}
476# endif /* FEATURE_SUID_CONFIG */
477
478
479# if ENABLE_FEATURE_SUID
480static void check_suid(int applet_no)
481{
482 gid_t rgid; /* real gid */
483
484 if (ruid == 0) /* set by parse_config_file() */
485 return; /* run by root - no need to check more */
486 rgid = getgid();
487
488# if ENABLE_FEATURE_SUID_CONFIG
489 if (suid_cfg_readable) {
490 uid_t uid;
491 struct suid_config_t *sct;
492 mode_t m;
493
494 for (sct = suid_config; sct; sct = sct->m_next) {
495 if (sct->m_applet == applet_no)
496 goto found;
497 }
498 goto check_need_suid;
499 found:
500 /* Is this user allowed to run this applet? */
501 m = sct->m_mode;
502 if (sct->m_ugid.uid == ruid)
503 /* same uid */
504 m >>= 6;
505 else if ((sct->m_ugid.gid == rgid) || ingroup(ruid, sct->m_ugid.gid))
506 /* same group / in group */
507 m >>= 3;
508 if (!(m & S_IXOTH)) /* is x bit not set? */
509 bb_error_msg_and_die("you have no permission to run this applet");
510
511 /* We set effective AND saved ids. If saved-id is not set
512 * like we do below, seteuid(0) can still later succeed! */
513
514 /* Are we directed to change gid
515 * (APPLET = *s* USER.GROUP or APPLET = *S* USER.GROUP)?
516 */
517 if (sct->m_mode & S_ISGID)
518 rgid = sct->m_ugid.gid;
519 /* else: we will set egid = rgid, thus dropping sgid effect */
520 if (setresgid(-1, rgid, rgid))
521 bb_perror_msg_and_die("setresgid");
522
523 /* Are we directed to change uid
524 * (APPLET = s** USER.GROUP or APPLET = S** USER.GROUP)?
525 */
526 uid = ruid;
527 if (sct->m_mode & S_ISUID)
528 uid = sct->m_ugid.uid;
529 /* else: we will set euid = ruid, thus dropping suid effect */
530 if (setresuid(-1, uid, uid))
531 bb_perror_msg_and_die("setresuid");
532
533 goto ret;
534 }
535# if !ENABLE_FEATURE_SUID_CONFIG_QUIET
536 {
537 static bool onetime = 0;
538
539 if (!onetime) {
540 onetime = 1;
541 bb_error_msg("using fallback suid method");
542 }
543 }
544# endif
545 check_need_suid:
546# endif
547 if (APPLET_SUID(applet_no) == BB_SUID_REQUIRE) {
548 /* Real uid is not 0. If euid isn't 0 too, suid bit
549 * is most probably not set on our executable */
550 if (geteuid())
551 bb_error_msg_and_die("must be suid to work properly");
552 } else if (APPLET_SUID(applet_no) == BB_SUID_DROP) {
553 xsetgid(rgid); /* drop all privileges */
554 xsetuid(ruid);
555 }
556# if ENABLE_FEATURE_SUID_CONFIG
557 ret: ;
558 llist_free((llist_t*)suid_config, NULL);
559# endif
560}
561# else
562# define check_suid(x) ((void)0)
563# endif /* FEATURE_SUID */
564
565
566# if ENABLE_FEATURE_INSTALLER
567static const char usr_bin [] ALIGN1 = "/usr/bin/";
568static const char usr_sbin[] ALIGN1 = "/usr/sbin/";
569static const char *const install_dir[] = {
570 &usr_bin [8], /* "/" */
571 &usr_bin [4], /* "/bin/" */
572 &usr_sbin[4] /* "/sbin/" */
573# if !ENABLE_INSTALL_NO_USR
574 ,usr_bin
575 ,usr_sbin
576# endif
577};
578
579/* create (sym)links for each applet */
580static void install_links(const char *busybox, int use_symbolic_links,
581 char *custom_install_dir)
582{
583 /* directory table
584 * this should be consistent w/ the enum,
585 * busybox.h::bb_install_loc_t, or else... */
586 int (*lf)(const char *, const char *);
587 char *fpc;
588 unsigned i;
589 int rc;
590
591 lf = link;
592 if (use_symbolic_links)
593 lf = symlink;
594
595 for (i = 0; i < ARRAY_SIZE(applet_main); i++) {
596 fpc = concat_path_file(
597 custom_install_dir ? custom_install_dir : install_dir[APPLET_INSTALL_LOC(i)],
598 APPLET_NAME(i));
599 // debug: bb_error_msg("%slinking %s to busybox",
600 // use_symbolic_links ? "sym" : "", fpc);
601 rc = lf(busybox, fpc);
602 if (rc != 0 && errno != EEXIST) {
603 bb_simple_perror_msg(fpc);
604 }
605 free(fpc);
606 }
607}
608# else
609# define install_links(x,y,z) ((void)0)
610# endif
611
612/* If we were called as "busybox..." */
613static int busybox_main(char **argv)
614{
615 if (!argv[1]) {
616 /* Called without arguments */
617 const char *a;
618 int col;
619 unsigned output_width;
620 help:
621 output_width = 80;
622 if (ENABLE_FEATURE_AUTOWIDTH) {
623 /* Obtain the terminal width */
624 get_terminal_width_height(0, &output_width, NULL);
625 }
626
627 dup2(1, 2);
628 full_write2_str(bb_banner); /* reuse const string */
629 full_write2_str(" multi-call binary.\n"); /* reuse */
630 full_write2_str(
631 "BusyBox is copyrighted by many authors between 1998-2012.\n"
632 "Licensed under GPLv2. See source distribution for detailed\n"
633 "copyright notices.\n"
634 "\n"
635 "Usage: busybox [function [arguments]...]\n"
636 " or: busybox --list"IF_FEATURE_INSTALLER("[-full]")"\n"
637 IF_FEATURE_INSTALLER(
638 " or: busybox --install [-s] [DIR]\n"
639 )
640 " or: function [arguments]...\n"
641 "\n"
642 "\tBusyBox is a multi-call binary that combines many common Unix\n"
643 "\tutilities into a single executable. Most people will create a\n"
644 "\tlink to busybox for each function they wish to use and BusyBox\n"
645 "\twill act like whatever it was invoked as.\n"
646 "\n"
647 "Currently defined functions:\n"
648 );
649 col = 0;
650 a = applet_names;
651 /* prevent last comma to be in the very last pos */
652 output_width--;
653 while (*a) {
654 int len2 = strlen(a) + 2;
655 if (col >= (int)output_width - len2) {
656 full_write2_str(",\n");
657 col = 0;
658 }
659 if (col == 0) {
660 col = 6;
661 full_write2_str("\t");
662 } else {
663 full_write2_str(", ");
664 }
665 full_write2_str(a);
666 col += len2;
667 a += len2 - 1;
668 }
669 full_write2_str("\n\n");
670 return 0;
671 }
672
673 if (strncmp(argv[1], "--list", 6) == 0) {
674 unsigned i = 0;
675 const char *a = applet_names;
676 dup2(1, 2);
677 while (*a) {
678# if ENABLE_FEATURE_INSTALLER
679 if (argv[1][6]) /* --list-full? */
680 full_write2_str(install_dir[APPLET_INSTALL_LOC(i)] + 1);
681# endif
682 full_write2_str(a);
683 full_write2_str("\n");
684 i++;
685 a += strlen(a) + 1;
686 }
687 return 0;
688 }
689
690 if (ENABLE_FEATURE_INSTALLER && strcmp(argv[1], "--install") == 0) {
691 int use_symbolic_links;
692 const char *busybox;
693
694 busybox = xmalloc_readlink(bb_busybox_exec_path);
695 if (!busybox) {
696 /* bb_busybox_exec_path is usually "/proc/self/exe".
697 * In chroot, readlink("/proc/self/exe") usually fails.
698 * In such case, better use argv[0] as symlink target
699 * if it is a full path name.
700 */
701 if (argv[0][0] != '/')
702 bb_error_msg_and_die("'%s' is not an absolute path", argv[0]);
703 busybox = argv[0];
704 }
705 /* busybox --install [-s] [DIR]:
706 * -s: make symlinks
707 * DIR: directory to install links to
708 */
709 use_symbolic_links = (argv[2] && strcmp(argv[2], "-s") == 0 && ++argv);
710 install_links(busybox, use_symbolic_links, argv[2]);
711 return 0;
712 }
713
714 if (strcmp(argv[1], "--help") == 0) {
715 /* "busybox --help [<applet>]" */
716 if (!argv[2])
717 goto help;
718 /* convert to "<applet> --help" */
719 argv[0] = argv[2];
720 argv[2] = NULL;
721 } else {
722 /* "busybox <applet> arg1 arg2 ..." */
723 argv++;
724 }
725 /* We support "busybox /a/path/to/applet args..." too. Allows for
726 * "#!/bin/busybox"-style wrappers */
727 applet_name = bb_get_last_path_component_nostrip(argv[0]);
728 run_applet_and_exit(applet_name, argv);
729
730 /*bb_error_msg_and_die("applet not found"); - sucks in printf */
731 full_write2_str(applet_name);
732 full_write2_str(": applet not found\n");
733 xfunc_die();
734}
735
736void FAST_FUNC run_applet_no_and_exit(int applet_no, char **argv)
737{
738 int argc = 1;
739
740 while (argv[argc])
741 argc++;
742
743 /* Reinit some shared global data */
744 xfunc_error_retval = EXIT_FAILURE;
745
746 applet_name = APPLET_NAME(applet_no);
747 if (argc == 2 && strcmp(argv[1], "--help") == 0) {
748 /* Special case. POSIX says "test --help"
749 * should be no different from e.g. "test --foo". */
750//TODO: just compare applet_no with APPLET_NO_test
751 if (!ENABLE_TEST || strcmp(applet_name, "test") != 0) {
752 /* If you want "foo --help" to return 0: */
753 /*xfunc_error_retval = 0;*/
754 bb_show_usage();
755 }
756 }
757 if (ENABLE_FEATURE_SUID)
758 check_suid(applet_no);
759 exit(applet_main[applet_no](argc, argv));
760}
761
762void FAST_FUNC run_applet_and_exit(const char *name, char **argv)
763{
764 int applet = find_applet_by_name(name);
765 if (applet >= 0)
766 run_applet_no_and_exit(applet, argv);
767 if (strncmp(name, "busybox", 7) == 0)
768 exit(busybox_main(argv));
769}
770
771#endif /* !defined(SINGLE_APPLET_MAIN) */
772
773
774
775#if ENABLE_BUILD_LIBBUSYBOX
776int lbb_main(char **argv)
777#else
778int main(int argc UNUSED_PARAM, char **argv)
779#endif
780{
781 /* Tweak malloc for reduced memory consumption */
782#ifdef M_TRIM_THRESHOLD
783 /* M_TRIM_THRESHOLD is the maximum amount of freed top-most memory
784 * to keep before releasing to the OS
785 * Default is way too big: 256k
786 */
787 mallopt(M_TRIM_THRESHOLD, 8 * 1024);
788#endif
789#ifdef M_MMAP_THRESHOLD
790 /* M_MMAP_THRESHOLD is the request size threshold for using mmap()
791 * Default is too big: 256k
792 */
793 mallopt(M_MMAP_THRESHOLD, 32 * 1024 - 256);
794#endif
795
796#if !BB_MMU
797 /* NOMMU re-exec trick sets high-order bit in first byte of name */
798 if (argv[0][0] & 0x80) {
799 re_execed = 1;
800 argv[0][0] &= 0x7f;
801 }
802#endif
803
804#if defined(SINGLE_APPLET_MAIN)
805 /* Only one applet is selected in .config */
806 if (argv[1] && strncmp(argv[0], "busybox", 7) == 0) {
807 /* "busybox <applet> <params>" should still work as expected */
808 argv++;
809 }
810 /* applet_names in this case is just "applet\0\0" */
811 lbb_prepare(applet_names IF_FEATURE_INDIVIDUAL(, argv));
812 return SINGLE_APPLET_MAIN(argc, argv);
813#else
814 lbb_prepare("busybox" IF_FEATURE_INDIVIDUAL(, argv));
815
816 applet_name = argv[0];
817 if (applet_name[0] == '-')
818 applet_name++;
819 applet_name = bb_basename(applet_name);
820
821 parse_config_file(); /* ...maybe, if FEATURE_SUID_CONFIG */
822
823 run_applet_and_exit(applet_name, argv);
824
825 /*bb_error_msg_and_die("applet not found"); - sucks in printf */
826 full_write2_str(applet_name);
827 full_write2_str(": applet not found\n");
828 xfunc_die();
829#endif
830}
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