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

Last change on this file since 3232 was 3232, checked in by Bruno Cornec, 7 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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