blob: 0f83eda4bd87390a1778f8ee1a415b07351ffcf1 [file] [log] [blame]
Denis Vlasenkoac7d0e32007-10-08 19:32:12 +00001/* vi: set sw=4 ts=4: */
2/*
Denis Vlasenko724d1962007-10-10 14:41:07 +00003 * Utility routines.
Denis Vlasenkoac7d0e32007-10-08 19:32:12 +00004 *
Denis Vlasenko724d1962007-10-10 14:41:07 +00005 * 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.
Denis Vlasenkoac7d0e32007-10-08 19:32:12 +00008 *
Denis Vlasenko724d1962007-10-10 14:41:07 +00009 * Based in part on code from sash, Copyright (c) 1999 by David I. Bell
Denys Vlasenko0ef64bd2010-08-16 20:14:46 +020010 * Permission has been granted to redistribute this code under GPL.
Denis Vlasenko724d1962007-10-10 14:41:07 +000011 *
Denys Vlasenko0ef64bd2010-08-16 20:14:46 +020012 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
Denis Vlasenkoac7d0e32007-10-08 19:32:12 +000013 */
14
Denis Vlasenko79cedcb2008-04-08 21:13:28 +000015/* 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 */
Denys Vlasenkoc1947f12009-10-23 01:30:26 +020029#include "busybox.h"
Denys Vlasenko9be47022011-05-16 12:21:31 +020030
Denys Vlasenko8da415e2010-12-05 01:30:14 +010031#if !(defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__NetBSD__) \
Denys Vlasenko982e87f2013-07-30 11:52:58 +020032 || defined(__APPLE__) \
Denys Vlasenko8da415e2010-12-05 01:30:14 +010033 )
34# include <malloc.h> /* for mallopt */
35#endif
Denys Vlasenko9be47022011-05-16 12:21:31 +020036
Denis Vlasenkoac7d0e32007-10-08 19:32:12 +000037
38/* Declare <applet>_main() */
39#define PROTOTYPES
40#include "applets.h"
41#undef PROTOTYPES
42
Denis Vlasenko32b2a9f2008-02-22 22:43:22 +000043/* Include generated applet names, pointers to <applet>_main, etc */
Denis Vlasenko1aa7e472007-11-28 06:49:03 +000044#include "applet_tables.h"
Denis Vlasenko468aea22008-04-01 14:47:57 +000045/* ...and if applet_tables generator says we have only one applet... */
46#ifdef SINGLE_APPLET_MAIN
Denys Vlasenko0e5ba082010-06-05 23:11:07 +020047# undef ENABLE_FEATURE_INDIVIDUAL
48# define ENABLE_FEATURE_INDIVIDUAL 1
49# undef IF_FEATURE_INDIVIDUAL
50# define IF_FEATURE_INDIVIDUAL(...) __VA_ARGS__
Denis Vlasenko468aea22008-04-01 14:47:57 +000051#endif
Denis Vlasenkoac7d0e32007-10-08 19:32:12 +000052
Denys Vlasenko0e5ba082010-06-05 23:11:07 +020053#include "usage_compressed.h"
54
Denys Vlasenko9be47022011-05-16 12:21:31 +020055
Denys Vlasenko0e5ba082010-06-05 23:11:07 +020056#if ENABLE_SHOW_USAGE && !ENABLE_FEATURE_COMPRESS_USAGE
57static const char usage_messages[] ALIGN1 = UNPACKED_USAGE;
58#else
59# define usage_messages 0
Denys Vlasenko1fcbff22010-06-26 02:40:08 +020060#endif
Denys Vlasenko0e5ba082010-06-05 23:11:07 +020061
Denis Vlasenkoac7d0e32007-10-08 19:32:12 +000062#if ENABLE_FEATURE_COMPRESS_USAGE
63
Denys Vlasenko5c296de2010-07-03 14:28:35 +020064static const char packed_usage[] ALIGN1 = { PACKED_USAGE };
Denys Vlasenkod184a722011-09-22 12:45:14 +020065# include "bb_archive.h"
Denis Vlasenkoac7d0e32007-10-08 19:32:12 +000066static 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,
Denys Vlasenkocaddfc82010-10-28 23:08:53 +020074 /* inbuf: */ packed_usage,
Denis Vlasenkoac7d0e32007-10-08 19:32:12 +000075 /* 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! */
Denys Vlasenko0e5ba082010-06-05 23:11:07 +020080 outbuf = malloc_or_warn(sizeof(UNPACKED_USAGE));
Denis Vlasenkoac7d0e32007-10-08 19:32:12 +000081 if (outbuf)
Denys Vlasenko0e5ba082010-06-05 23:11:07 +020082 read_bunzip(bd, outbuf, sizeof(UNPACKED_USAGE));
Denis Vlasenkoac7d0e32007-10-08 19:32:12 +000083 }
84 dealloc_bunzip(bd);
85 return outbuf;
86}
Denys Vlasenko0e5ba082010-06-05 23:11:07 +020087# define dealloc_usage_messages(s) free(s)
Denis Vlasenkoac7d0e32007-10-08 19:32:12 +000088
89#else
90
Denys Vlasenko0e5ba082010-06-05 23:11:07 +020091# define unpack_usage_messages() usage_messages
92# define dealloc_usage_messages(s) ((void)(s))
Denis Vlasenkoac7d0e32007-10-08 19:32:12 +000093
94#endif /* FEATURE_COMPRESS_USAGE */
95
96
Denis Vlasenkodefc1ea2008-06-27 02:52:20 +000097void FAST_FUNC bb_show_usage(void)
Denis Vlasenkoac7d0e32007-10-08 19:32:12 +000098{
99 if (ENABLE_SHOW_USAGE) {
Denis Vlasenko468aea22008-04-01 14:47:57 +0000100#ifdef SINGLE_APPLET_STR
101 /* Imagine that this applet is "true". Dont suck in printf! */
Lauri Kasanen2b662c52010-11-13 23:16:05 +0100102 const char *usage_string = unpack_usage_messages();
Denis Vlasenko468aea22008-04-01 14:47:57 +0000103
Lauri Kasanen2b662c52010-11-13 23:16:05 +0100104 if (*usage_string == '\b') {
Denis Vlasenko42404082008-11-24 13:42:24 +0000105 full_write2_str("No help available.\n\n");
Denis Vlasenko468aea22008-04-01 14:47:57 +0000106 } else {
Denis Vlasenko42404082008-11-24 13:42:24 +0000107 full_write2_str("Usage: "SINGLE_APPLET_STR" ");
Lauri Kasanen2b662c52010-11-13 23:16:05 +0100108 full_write2_str(usage_string);
Denis Vlasenko79cedcb2008-04-08 21:13:28 +0000109 full_write2_str("\n\n");
Denis Vlasenko468aea22008-04-01 14:47:57 +0000110 }
Denys Vlasenko630dde12009-08-30 19:57:49 +0200111 if (ENABLE_FEATURE_CLEAN_UP)
112 dealloc_usage_messages((char*)usage_string);
Denis Vlasenko468aea22008-04-01 14:47:57 +0000113#else
Denis Vlasenkoac7d0e32007-10-08 19:32:12 +0000114 const char *p;
115 const char *usage_string = p = unpack_usage_messages();
Denis Vlasenko1aa7e472007-11-28 06:49:03 +0000116 int ap = find_applet_by_name(applet_name);
Denis Vlasenkoac7d0e32007-10-08 19:32:12 +0000117
Denis Vlasenko1aa7e472007-11-28 06:49:03 +0000118 if (ap < 0) /* never happens, paranoia */
Denis Vlasenkoac7d0e32007-10-08 19:32:12 +0000119 xfunc_die();
Denis Vlasenko1aa7e472007-11-28 06:49:03 +0000120 while (ap) {
Denis Vlasenkoac7d0e32007-10-08 19:32:12 +0000121 while (*p++) continue;
Denis Vlasenko1aa7e472007-11-28 06:49:03 +0000122 ap--;
Denis Vlasenkoac7d0e32007-10-08 19:32:12 +0000123 }
Denis Vlasenko79cedcb2008-04-08 21:13:28 +0000124 full_write2_str(bb_banner);
Denys Vlasenko630dde12009-08-30 19:57:49 +0200125 full_write2_str(" multi-call binary.\n");
Denis Vlasenkoac7d0e32007-10-08 19:32:12 +0000126 if (*p == '\b')
Denis Vlasenko79cedcb2008-04-08 21:13:28 +0000127 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);
Denys Vlasenko7f4a49a2015-05-25 14:30:52 +0200133 full_write2_str("\n");
Denis Vlasenko79cedcb2008-04-08 21:13:28 +0000134 }
Denys Vlasenko630dde12009-08-30 19:57:49 +0200135 if (ENABLE_FEATURE_CLEAN_UP)
136 dealloc_usage_messages((char*)usage_string);
Denis Vlasenko468aea22008-04-01 14:47:57 +0000137#endif
Denis Vlasenkoac7d0e32007-10-08 19:32:12 +0000138 }
139 xfunc_die();
140}
141
Denis Vlasenko79cedcb2008-04-08 21:13:28 +0000142#if NUM_APPLETS > 8
Denys Vlasenko5d783552013-01-17 11:02:21 +0100143static int applet_name_compare(const void *name, const void *idx)
Denis Vlasenkoac7d0e32007-10-08 19:32:12 +0000144{
Denys Vlasenko5d783552013-01-17 11:02:21 +0100145 int i = (int)(ptrdiff_t)idx - 1;
Denis Vlasenko1aa7e472007-11-28 06:49:03 +0000146 return strcmp(name, APPLET_NAME(i));
Denis Vlasenkoac7d0e32007-10-08 19:32:12 +0000147}
Denis Vlasenko79cedcb2008-04-08 21:13:28 +0000148#endif
Denis Vlasenkodefc1ea2008-06-27 02:52:20 +0000149int FAST_FUNC find_applet_by_name(const char *name)
Denis Vlasenkoac7d0e32007-10-08 19:32:12 +0000150{
Denis Vlasenko79cedcb2008-04-08 21:13:28 +0000151#if NUM_APPLETS > 8
Denis Vlasenkoac7d0e32007-10-08 19:32:12 +0000152 /* Do a binary search to find the applet entry given the name. */
Denis Vlasenko745cd172007-11-29 03:31:20 +0000153 const char *p;
Denys Vlasenko5d783552013-01-17 11:02:21 +0100154 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;
Denis Vlasenko79cedcb2008-04-08 21:13:28 +0000160#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
Denis Vlasenkoac7d0e32007-10-08 19:32:12 +0000172}
173
174
Denis Vlasenko68404f12008-03-17 09:00:54 +0000175void lbb_prepare(const char *applet
Denis Vlasenko5e34ff22009-04-21 11:09:40 +0000176 IF_FEATURE_INDIVIDUAL(, char **argv))
Denis Vlasenko468aea22008-04-01 14:47:57 +0000177 MAIN_EXTERNALLY_VISIBLE;
178void lbb_prepare(const char *applet
Denis Vlasenko5e34ff22009-04-21 11:09:40 +0000179 IF_FEATURE_INDIVIDUAL(, char **argv))
Denis Vlasenkoac7d0e32007-10-08 19:32:12 +0000180{
181#ifdef __GLIBC__
182 (*(int **)&bb_errno) = __errno_location();
Denis Vlasenko574f2f42008-02-27 18:41:59 +0000183 barrier();
Denis Vlasenkoac7d0e32007-10-08 19:32:12 +0000184#endif
Denis Vlasenko15cb4a42007-10-11 10:06:26 +0000185 applet_name = applet;
Denis Vlasenkoac7d0e32007-10-08 19:32:12 +0000186
Denys Vlasenko45b4ecc2014-08-11 20:33:18 +0200187 if (ENABLE_LOCALE_SUPPORT)
Denis Vlasenkoac7d0e32007-10-08 19:32:12 +0000188 setlocale(LC_ALL, "");
189
Denis Vlasenko82d38da2007-10-10 14:38:47 +0000190#if ENABLE_FEATURE_INDIVIDUAL
191 /* Redundant for busybox (run_applet_and_exit covers that case)
192 * but needed for "individual applet" mode */
Denys Vlasenko9297dbc2010-07-05 21:37:12 +0200193 if (argv[1]
194 && !argv[2]
195 && strcmp(argv[1], "--help") == 0
Denys Vlasenko8dff01d2015-03-12 17:48:34 +0100196 && !is_prefixed_with(applet, "busybox")
Denys Vlasenko9297dbc2010-07-05 21:37:12 +0200197 ) {
Denis Vlasenkobd28f6b2008-07-19 08:15:13 +0000198 /* Special case. POSIX says "test --help"
199 * should be no different from e.g. "test --foo". */
200 if (!ENABLE_TEST || strcmp(applet_name, "test") != 0)
201 bb_show_usage();
202 }
Denis Vlasenko82d38da2007-10-10 14:38:47 +0000203#endif
Denis Vlasenkoac7d0e32007-10-08 19:32:12 +0000204}
Denis Vlasenko724d1962007-10-10 14:41:07 +0000205
206/* The code below can well be in applets/applets.c, as it is used only
207 * for busybox binary, not "individual" binaries.
208 * However, keeping it here and linking it into libbusybox.so
209 * (together with remaining tiny applets/applets.o)
210 * makes it possible to avoid --whole-archive at link time.
211 * This makes (shared busybox) + libbusybox smaller.
212 * (--gc-sections would be even better....)
213 */
214
215const char *applet_name;
216#if !BB_MMU
217bool re_execed;
218#endif
219
Denis Vlasenko468aea22008-04-01 14:47:57 +0000220
Denis Vlasenko10f6fb12008-04-29 00:10:27 +0000221/* If not built as a single-applet executable... */
222#if !defined(SINGLE_APPLET_MAIN)
Denis Vlasenko468aea22008-04-01 14:47:57 +0000223
Denis Vlasenko5e34ff22009-04-21 11:09:40 +0000224IF_FEATURE_SUID(static uid_t ruid;) /* real uid */
Denis Vlasenko724d1962007-10-10 14:41:07 +0000225
Denys Vlasenko8f0af3b2010-11-29 02:55:35 +0100226# if ENABLE_FEATURE_SUID_CONFIG
Denis Vlasenko724d1962007-10-10 14:41:07 +0000227
Denys Vlasenko9be47022011-05-16 12:21:31 +0200228static struct suid_config_t {
229 /* next ptr must be first: this struct needs to be llist-compatible */
230 struct suid_config_t *m_next;
Denys Vlasenko4566e172011-05-16 00:01:08 +0200231 struct bb_uidgid_t m_ugid;
Denys Vlasenko9be47022011-05-16 12:21:31 +0200232 int m_applet;
Denis Vlasenko724d1962007-10-10 14:41:07 +0000233 mode_t m_mode;
Denis Vlasenko724d1962007-10-10 14:41:07 +0000234} *suid_config;
235
236static bool suid_cfg_readable;
237
238/* check if u is member of group g */
239static int ingroup(uid_t u, gid_t g)
240{
241 struct group *grp = getgrgid(g);
Denis Vlasenko724d1962007-10-10 14:41:07 +0000242 if (grp) {
243 char **mem;
Denis Vlasenko724d1962007-10-10 14:41:07 +0000244 for (mem = grp->gr_mem; *mem; mem++) {
245 struct passwd *pwd = getpwnam(*mem);
Denis Vlasenko724d1962007-10-10 14:41:07 +0000246 if (pwd && (pwd->pw_uid == u))
247 return 1;
248 }
249 }
250 return 0;
251}
252
Denys Vlasenkod83aff12011-05-16 13:53:19 +0200253/* libbb candidate */
Denis Vlasenko724d1962007-10-10 14:41:07 +0000254static char *get_trimmed_slice(char *s, char *e)
255{
256 /* First, consider the value at e to be nul and back up until we
257 * reach a non-space char. Set the char after that (possibly at
258 * the original e) to nul. */
259 while (e-- > s) {
260 if (!isspace(*e)) {
261 break;
262 }
263 }
264 e[1] = '\0';
265
266 /* Next, advance past all leading space and return a ptr to the
267 * first non-space char; possibly the terminating nul. */
268 return skip_whitespace(s);
269}
270
Denis Vlasenko724d1962007-10-10 14:41:07 +0000271static void parse_config_file(void)
272{
Denys Vlasenko3770b6b2011-05-16 13:19:25 +0200273 /* Don't depend on the tools to combine strings. */
274 static const char config_file[] ALIGN1 = "/etc/busybox.conf";
275
Denys Vlasenko9be47022011-05-16 12:21:31 +0200276 struct suid_config_t *sct_head;
Denis Vlasenko1aa7e472007-11-28 06:49:03 +0000277 int applet_no;
Denis Vlasenko724d1962007-10-10 14:41:07 +0000278 FILE *f;
279 const char *errmsg;
Denis Vlasenko724d1962007-10-10 14:41:07 +0000280 unsigned lc;
281 smallint section;
Denis Vlasenko724d1962007-10-10 14:41:07 +0000282 struct stat st;
283
Denis Vlasenko724d1962007-10-10 14:41:07 +0000284 ruid = getuid();
285 if (ruid == 0) /* run by root - don't need to even read config file */
286 return;
287
288 if ((stat(config_file, &st) != 0) /* No config file? */
289 || !S_ISREG(st.st_mode) /* Not a regular file? */
290 || (st.st_uid != 0) /* Not owned by root? */
291 || (st.st_mode & (S_IWGRP | S_IWOTH)) /* Writable by non-root? */
Denys Vlasenko4566e172011-05-16 00:01:08 +0200292 || !(f = fopen_for_read(config_file)) /* Cannot open? */
Denis Vlasenko724d1962007-10-10 14:41:07 +0000293 ) {
294 return;
295 }
296
297 suid_cfg_readable = 1;
298 sct_head = NULL;
299 section = lc = 0;
300
301 while (1) {
Denys Vlasenko9be47022011-05-16 12:21:31 +0200302 char buffer[256];
303 char *s;
Denis Vlasenko724d1962007-10-10 14:41:07 +0000304
Denys Vlasenko9be47022011-05-16 12:21:31 +0200305 if (!fgets(buffer, sizeof(buffer), f)) { /* Are we done? */
Denys Vlasenko4566e172011-05-16 00:01:08 +0200306 // Looks like bloat
307 //if (ferror(f)) { /* Make sure it wasn't a read error. */
308 // errmsg = "reading";
309 // goto pe_label;
310 //}
Denis Vlasenko724d1962007-10-10 14:41:07 +0000311 fclose(f);
312 suid_config = sct_head; /* Success, so set the pointer. */
313 return;
314 }
315
Denys Vlasenko9be47022011-05-16 12:21:31 +0200316 s = buffer;
Denis Vlasenko724d1962007-10-10 14:41:07 +0000317 lc++; /* Got a (partial) line. */
318
319 /* If a line is too long for our buffer, we consider it an error.
320 * The following test does mistreat one corner case though.
321 * If the final line of the file does not end with a newline and
322 * yet exactly fills the buffer, it will be treated as too long
323 * even though there isn't really a problem. But it isn't really
324 * worth adding code to deal with such an unlikely situation, and
325 * we do err on the side of caution. Besides, the line would be
326 * too long if it did end with a newline. */
327 if (!strchr(s, '\n') && !feof(f)) {
Denys Vlasenko4566e172011-05-16 00:01:08 +0200328 errmsg = "line too long";
329 goto pe_label;
Denis Vlasenko724d1962007-10-10 14:41:07 +0000330 }
331
332 /* Trim leading and trailing whitespace, ignoring comments, and
333 * check if the resulting string is empty. */
334 s = get_trimmed_slice(s, strchrnul(s, '#'));
335 if (!*s) {
336 continue;
337 }
338
339 /* Check for a section header. */
340
341 if (*s == '[') {
342 /* Unlike the old code, we ignore leading and trailing
343 * whitespace for the section name. We also require that
344 * there are no stray characters after the closing bracket. */
Denys Vlasenko9be47022011-05-16 12:21:31 +0200345 char *e = strchr(s, ']');
Denis Vlasenko724d1962007-10-10 14:41:07 +0000346 if (!e /* Missing right bracket? */
347 || e[1] /* Trailing characters? */
348 || !*(s = get_trimmed_slice(s+1, e)) /* Missing name? */
349 ) {
Denys Vlasenko4566e172011-05-16 00:01:08 +0200350 errmsg = "section header";
351 goto pe_label;
Denis Vlasenko724d1962007-10-10 14:41:07 +0000352 }
353 /* Right now we only have one section so just check it.
354 * If more sections are added in the future, please don't
355 * resort to cascading ifs with multiple strcasecmp calls.
356 * That kind of bloated code is all too common. A loop
357 * and a string table would be a better choice unless the
358 * number of sections is very small. */
359 if (strcasecmp(s, "SUID") == 0) {
360 section = 1;
361 continue;
362 }
363 section = -1; /* Unknown section so set to skip. */
364 continue;
365 }
366
367 /* Process sections. */
368
369 if (section == 1) { /* SUID */
370 /* Since we trimmed leading and trailing space above, we're
371 * now looking for strings of the form
372 * <key>[::space::]*=[::space::]*<value>
373 * where both key and value could contain inner whitespace. */
374
375 /* First get the key (an applet name in our case). */
Denys Vlasenko9be47022011-05-16 12:21:31 +0200376 char *e = strchr(s, '=');
Denis Vlasenko724d1962007-10-10 14:41:07 +0000377 if (e) {
378 s = get_trimmed_slice(s, e);
379 }
380 if (!e || !*s) { /* Missing '=' or empty key. */
Denys Vlasenko4566e172011-05-16 00:01:08 +0200381 errmsg = "keyword";
382 goto pe_label;
Denis Vlasenko724d1962007-10-10 14:41:07 +0000383 }
384
385 /* Ok, we have an applet name. Process the rhs if this
386 * applet is currently built in and ignore it otherwise.
387 * Note: this can hide config file bugs which only pop
388 * up when the busybox configuration is changed. */
Denis Vlasenko1aa7e472007-11-28 06:49:03 +0000389 applet_no = find_applet_by_name(s);
390 if (applet_no >= 0) {
Denys Vlasenko3770b6b2011-05-16 13:19:25 +0200391 unsigned i;
Denys Vlasenko9be47022011-05-16 12:21:31 +0200392 struct suid_config_t *sct;
393
Denis Vlasenko724d1962007-10-10 14:41:07 +0000394 /* Note: We currently don't check for duplicates!
395 * The last config line for each applet will be the
396 * one used since we insert at the head of the list.
397 * I suppose this could be considered a feature. */
Denys Vlasenko4566e172011-05-16 00:01:08 +0200398 sct = xzalloc(sizeof(*sct));
Denis Vlasenko1aa7e472007-11-28 06:49:03 +0000399 sct->m_applet = applet_no;
Denys Vlasenko4566e172011-05-16 00:01:08 +0200400 /*sct->m_mode = 0;*/
Denis Vlasenko724d1962007-10-10 14:41:07 +0000401 sct->m_next = sct_head;
402 sct_head = sct;
403
404 /* Get the specified mode. */
405
406 e = skip_whitespace(e+1);
407
408 for (i = 0; i < 3; i++) {
Denys Vlasenko3770b6b2011-05-16 13:19:25 +0200409 /* There are 4 chars for each of user/group/other.
410 * "x-xx" instead of "x-" are to make
411 * "idx > 3" check catch invalid chars.
412 */
413 static const char mode_chars[] ALIGN1 = "Ssx-" "Ssx-" "x-xx";
414 static const unsigned short mode_mask[] ALIGN2 = {
415 S_ISUID, S_ISUID|S_IXUSR, S_IXUSR, 0, /* Ssx- */
416 S_ISGID, S_ISGID|S_IXGRP, S_IXGRP, 0, /* Ssx- */
417 S_IXOTH, 0 /* x- */
418 };
419 const char *q = strchrnul(mode_chars + 4*i, *e);
420 unsigned idx = q - (mode_chars + 4*i);
421 if (idx > 3) {
Denys Vlasenko4566e172011-05-16 00:01:08 +0200422 errmsg = "mode";
423 goto pe_label;
Denis Vlasenko724d1962007-10-10 14:41:07 +0000424 }
Denys Vlasenko3770b6b2011-05-16 13:19:25 +0200425 sct->m_mode |= mode_mask[q - mode_chars];
426 e++;
Denis Vlasenko724d1962007-10-10 14:41:07 +0000427 }
428
Marek Polacekb0b88842011-04-16 17:33:43 +0200429 /* Now get the user/group info. */
Denis Vlasenko724d1962007-10-10 14:41:07 +0000430
431 s = skip_whitespace(e);
Denys Vlasenko351fec32011-05-16 14:30:26 +0200432 /* Default is 0.0, else parse USER.GROUP: */
433 if (*s) {
434 /* We require whitespace between mode and USER.GROUP */
435 if ((s == e) || !(e = strchr(s, '.'))) {
436 errmsg = "uid.gid";
437 goto pe_label;
438 }
439 *e = ':'; /* get_uidgid needs USER:GROUP syntax */
Denys Vlasenko526d8582015-10-19 04:27:17 +0200440 if (get_uidgid(&sct->m_ugid, s) == 0) {
Denys Vlasenko351fec32011-05-16 14:30:26 +0200441 errmsg = "unknown user/group";
442 goto pe_label;
443 }
Denis Vlasenko724d1962007-10-10 14:41:07 +0000444 }
445 }
446 continue;
447 }
448
449 /* Unknown sections are ignored. */
450
451 /* Encountering configuration lines prior to seeing a
452 * section header is treated as an error. This is how
453 * the old code worked, but it may not be desirable.
454 * We may want to simply ignore such lines in case they
455 * are used in some future version of busybox. */
456 if (!section) {
Denys Vlasenko4566e172011-05-16 00:01:08 +0200457 errmsg = "keyword outside section";
458 goto pe_label;
Denis Vlasenko724d1962007-10-10 14:41:07 +0000459 }
Denis Vlasenko724d1962007-10-10 14:41:07 +0000460 } /* while (1) */
461
462 pe_label:
Denys Vlasenko9be47022011-05-16 12:21:31 +0200463 fclose(f);
Denys Vlasenko4566e172011-05-16 00:01:08 +0200464 bb_error_msg("parse error in %s, line %u: %s", config_file, lc, errmsg);
Denis Vlasenko724d1962007-10-10 14:41:07 +0000465
Denis Vlasenko724d1962007-10-10 14:41:07 +0000466 /* Release any allocated memory before returning. */
Denys Vlasenko9be47022011-05-16 12:21:31 +0200467 llist_free((llist_t*)sct_head, NULL);
Denis Vlasenko724d1962007-10-10 14:41:07 +0000468}
Denys Vlasenko8f0af3b2010-11-29 02:55:35 +0100469# else
Denis Vlasenko724d1962007-10-10 14:41:07 +0000470static inline void parse_config_file(void)
471{
Denis Vlasenko5e34ff22009-04-21 11:09:40 +0000472 IF_FEATURE_SUID(ruid = getuid();)
Denis Vlasenko724d1962007-10-10 14:41:07 +0000473}
Denys Vlasenko8f0af3b2010-11-29 02:55:35 +0100474# endif /* FEATURE_SUID_CONFIG */
Denis Vlasenko724d1962007-10-10 14:41:07 +0000475
476
Denys Vlasenko8f0af3b2010-11-29 02:55:35 +0100477# if ENABLE_FEATURE_SUID
Denis Vlasenko1aa7e472007-11-28 06:49:03 +0000478static void check_suid(int applet_no)
Denis Vlasenko724d1962007-10-10 14:41:07 +0000479{
480 gid_t rgid; /* real gid */
481
482 if (ruid == 0) /* set by parse_config_file() */
483 return; /* run by root - no need to check more */
484 rgid = getgid();
485
Denys Vlasenko8f0af3b2010-11-29 02:55:35 +0100486# if ENABLE_FEATURE_SUID_CONFIG
Denis Vlasenko724d1962007-10-10 14:41:07 +0000487 if (suid_cfg_readable) {
488 uid_t uid;
Denys Vlasenko9be47022011-05-16 12:21:31 +0200489 struct suid_config_t *sct;
Denis Vlasenko724d1962007-10-10 14:41:07 +0000490 mode_t m;
491
492 for (sct = suid_config; sct; sct = sct->m_next) {
Denis Vlasenko1aa7e472007-11-28 06:49:03 +0000493 if (sct->m_applet == applet_no)
Denis Vlasenko724d1962007-10-10 14:41:07 +0000494 goto found;
495 }
Denis Vlasenko15ca51e2007-10-29 19:25:45 +0000496 goto check_need_suid;
Denis Vlasenko724d1962007-10-10 14:41:07 +0000497 found:
Denys Vlasenko3770b6b2011-05-16 13:19:25 +0200498 /* Is this user allowed to run this applet? */
Denis Vlasenko724d1962007-10-10 14:41:07 +0000499 m = sct->m_mode;
Denys Vlasenko4566e172011-05-16 00:01:08 +0200500 if (sct->m_ugid.uid == ruid)
Denis Vlasenko724d1962007-10-10 14:41:07 +0000501 /* same uid */
502 m >>= 6;
Denys Vlasenko4566e172011-05-16 00:01:08 +0200503 else if ((sct->m_ugid.gid == rgid) || ingroup(ruid, sct->m_ugid.gid))
Denis Vlasenko724d1962007-10-10 14:41:07 +0000504 /* same group / in group */
505 m >>= 3;
Denys Vlasenko3770b6b2011-05-16 13:19:25 +0200506 if (!(m & S_IXOTH)) /* is x bit not set? */
Denys Vlasenkod83aff12011-05-16 13:53:19 +0200507 bb_error_msg_and_die("you have no permission to run this applet");
Denis Vlasenko724d1962007-10-10 14:41:07 +0000508
Denis Vlasenko724d1962007-10-10 14:41:07 +0000509 /* We set effective AND saved ids. If saved-id is not set
Denys Vlasenko3770b6b2011-05-16 13:19:25 +0200510 * like we do below, seteuid(0) can still later succeed! */
511
512 /* Are we directed to change gid
513 * (APPLET = *s* USER.GROUP or APPLET = *S* USER.GROUP)?
514 */
515 if (sct->m_mode & S_ISGID)
516 rgid = sct->m_ugid.gid;
517 /* else: we will set egid = rgid, thus dropping sgid effect */
Denis Vlasenko724d1962007-10-10 14:41:07 +0000518 if (setresgid(-1, rgid, rgid))
519 bb_perror_msg_and_die("setresgid");
520
Denys Vlasenko3770b6b2011-05-16 13:19:25 +0200521 /* Are we directed to change uid
522 * (APPLET = s** USER.GROUP or APPLET = S** USER.GROUP)?
523 */
Denis Vlasenko724d1962007-10-10 14:41:07 +0000524 uid = ruid;
525 if (sct->m_mode & S_ISUID)
Denys Vlasenko4566e172011-05-16 00:01:08 +0200526 uid = sct->m_ugid.uid;
Denys Vlasenko3770b6b2011-05-16 13:19:25 +0200527 /* else: we will set euid = ruid, thus dropping suid effect */
Denis Vlasenko724d1962007-10-10 14:41:07 +0000528 if (setresuid(-1, uid, uid))
529 bb_perror_msg_and_die("setresuid");
Denys Vlasenko3770b6b2011-05-16 13:19:25 +0200530
Denys Vlasenko9be47022011-05-16 12:21:31 +0200531 goto ret;
Denis Vlasenko724d1962007-10-10 14:41:07 +0000532 }
Denys Vlasenko8f0af3b2010-11-29 02:55:35 +0100533# if !ENABLE_FEATURE_SUID_CONFIG_QUIET
Denis Vlasenko724d1962007-10-10 14:41:07 +0000534 {
535 static bool onetime = 0;
536
537 if (!onetime) {
538 onetime = 1;
Denys Vlasenko9be47022011-05-16 12:21:31 +0200539 bb_error_msg("using fallback suid method");
Denis Vlasenko724d1962007-10-10 14:41:07 +0000540 }
541 }
Denys Vlasenko8f0af3b2010-11-29 02:55:35 +0100542# endif
Denis Vlasenko15ca51e2007-10-29 19:25:45 +0000543 check_need_suid:
Denys Vlasenko8f0af3b2010-11-29 02:55:35 +0100544# endif
Denys Vlasenkob9f2d9f2011-01-18 13:58:01 +0100545 if (APPLET_SUID(applet_no) == BB_SUID_REQUIRE) {
Denis Vlasenko724d1962007-10-10 14:41:07 +0000546 /* Real uid is not 0. If euid isn't 0 too, suid bit
547 * is most probably not set on our executable */
548 if (geteuid())
Denis Vlasenko15ca51e2007-10-29 19:25:45 +0000549 bb_error_msg_and_die("must be suid to work properly");
Denys Vlasenkob9f2d9f2011-01-18 13:58:01 +0100550 } else if (APPLET_SUID(applet_no) == BB_SUID_DROP) {
Denis Vlasenko724d1962007-10-10 14:41:07 +0000551 xsetgid(rgid); /* drop all privileges */
552 xsetuid(ruid);
553 }
Denys Vlasenko9be47022011-05-16 12:21:31 +0200554# if ENABLE_FEATURE_SUID_CONFIG
Cristian Ionescu-Idbohrnea137aa2011-05-20 03:52:36 +0200555 ret: ;
Denys Vlasenko9be47022011-05-16 12:21:31 +0200556 llist_free((llist_t*)suid_config, NULL);
557# endif
Denis Vlasenko724d1962007-10-10 14:41:07 +0000558}
Denys Vlasenko8f0af3b2010-11-29 02:55:35 +0100559# else
560# define check_suid(x) ((void)0)
561# endif /* FEATURE_SUID */
Denis Vlasenko724d1962007-10-10 14:41:07 +0000562
563
Denys Vlasenko8f0af3b2010-11-29 02:55:35 +0100564# if ENABLE_FEATURE_INSTALLER
Denys Vlasenko5a7c7202010-04-20 21:02:57 -0400565static const char usr_bin [] ALIGN1 = "/usr/bin/";
566static const char usr_sbin[] ALIGN1 = "/usr/sbin/";
567static const char *const install_dir[] = {
568 &usr_bin [8], /* "/" */
569 &usr_bin [4], /* "/bin/" */
Denys Vlasenkod4d289a2010-10-12 04:18:05 +0200570 &usr_sbin[4] /* "/sbin/" */
Denys Vlasenko8f0af3b2010-11-29 02:55:35 +0100571# if !ENABLE_INSTALL_NO_USR
Denys Vlasenkod4d289a2010-10-12 04:18:05 +0200572 ,usr_bin
573 ,usr_sbin
Denys Vlasenko8f0af3b2010-11-29 02:55:35 +0100574# endif
Denys Vlasenko5a7c7202010-04-20 21:02:57 -0400575};
576
Denis Vlasenko724d1962007-10-10 14:41:07 +0000577/* create (sym)links for each applet */
Denys Vlasenko3b405432009-07-15 00:35:34 +0200578static void install_links(const char *busybox, int use_symbolic_links,
579 char *custom_install_dir)
Denis Vlasenko724d1962007-10-10 14:41:07 +0000580{
581 /* directory table
582 * this should be consistent w/ the enum,
583 * busybox.h::bb_install_loc_t, or else... */
Denis Vlasenko1aa7e472007-11-28 06:49:03 +0000584 int (*lf)(const char *, const char *);
Denis Vlasenko724d1962007-10-10 14:41:07 +0000585 char *fpc;
Denis Vlasenko6b06cb82008-05-15 21:30:45 +0000586 unsigned i;
Denis Vlasenko724d1962007-10-10 14:41:07 +0000587 int rc;
588
Denis Vlasenko1aa7e472007-11-28 06:49:03 +0000589 lf = link;
Denis Vlasenko724d1962007-10-10 14:41:07 +0000590 if (use_symbolic_links)
591 lf = symlink;
592
Denis Vlasenko745cd172007-11-29 03:31:20 +0000593 for (i = 0; i < ARRAY_SIZE(applet_main); i++) {
Denis Vlasenko724d1962007-10-10 14:41:07 +0000594 fpc = concat_path_file(
Denys Vlasenko3b405432009-07-15 00:35:34 +0200595 custom_install_dir ? custom_install_dir : install_dir[APPLET_INSTALL_LOC(i)],
Denis Vlasenko1aa7e472007-11-28 06:49:03 +0000596 APPLET_NAME(i));
Denis Vlasenko745cd172007-11-29 03:31:20 +0000597 // debug: bb_error_msg("%slinking %s to busybox",
598 // use_symbolic_links ? "sym" : "", fpc);
Denis Vlasenko724d1962007-10-10 14:41:07 +0000599 rc = lf(busybox, fpc);
600 if (rc != 0 && errno != EEXIST) {
601 bb_simple_perror_msg(fpc);
602 }
603 free(fpc);
604 }
605}
Denys Vlasenko8f0af3b2010-11-29 02:55:35 +0100606# else
Mike Frysingerf1999b52014-01-31 00:29:47 -0500607static void install_links(const char *busybox UNUSED_PARAM,
608 int use_symbolic_links UNUSED_PARAM,
609 char *custom_install_dir UNUSED_PARAM)
610{
611}
Denys Vlasenko8f0af3b2010-11-29 02:55:35 +0100612# endif
Denis Vlasenko724d1962007-10-10 14:41:07 +0000613
614/* If we were called as "busybox..." */
615static int busybox_main(char **argv)
616{
617 if (!argv[1]) {
618 /* Called without arguments */
Denis Vlasenko1aa7e472007-11-28 06:49:03 +0000619 const char *a;
Denys Vlasenko0149f022009-05-19 18:01:42 +0200620 int col;
621 unsigned output_width;
Denis Vlasenko724d1962007-10-10 14:41:07 +0000622 help:
623 output_width = 80;
624 if (ENABLE_FEATURE_AUTOWIDTH) {
625 /* Obtain the terminal width */
626 get_terminal_width_height(0, &output_width, NULL);
627 }
Denis Vlasenko724d1962007-10-10 14:41:07 +0000628
Denis Vlasenko21278df2008-06-25 12:15:46 +0000629 dup2(1, 2);
Denys Vlasenko630dde12009-08-30 19:57:49 +0200630 full_write2_str(bb_banner); /* reuse const string */
631 full_write2_str(" multi-call binary.\n"); /* reuse */
632 full_write2_str(
Aaro Koskinen7b729ed2015-04-02 00:55:17 +0300633 "BusyBox is copyrighted by many authors between 1998-2015.\n"
Bradley M. Kuhn0e941d52012-07-13 11:38:38 -0400634 "Licensed under GPLv2. See source distribution for detailed\n"
635 "copyright notices.\n"
Denys Vlasenko5a7c7202010-04-20 21:02:57 -0400636 "\n"
Denys Vlasenko02b8b9b2012-05-14 23:52:57 +0200637 "Usage: busybox [function [arguments]...]\n"
Denys Vlasenkoba888262012-03-22 11:15:06 +0100638 " or: busybox --list"IF_FEATURE_INSTALLER("[-full]")"\n"
639 IF_FEATURE_INSTALLER(
640 " or: busybox --install [-s] [DIR]\n"
641 )
Denys Vlasenko5a7c7202010-04-20 21:02:57 -0400642 " or: function [arguments]...\n"
643 "\n"
644 "\tBusyBox is a multi-call binary that combines many common Unix\n"
645 "\tutilities into a single executable. Most people will create a\n"
646 "\tlink to busybox for each function they wish to use and BusyBox\n"
647 "\twill act like whatever it was invoked as.\n"
648 "\n"
649 "Currently defined functions:\n"
650 );
Denis Vlasenko724d1962007-10-10 14:41:07 +0000651 col = 0;
Denis Vlasenko1aa7e472007-11-28 06:49:03 +0000652 a = applet_names;
Denys Vlasenko0149f022009-05-19 18:01:42 +0200653 /* prevent last comma to be in the very last pos */
654 output_width--;
Denis Vlasenko1aa7e472007-11-28 06:49:03 +0000655 while (*a) {
Denys Vlasenko0149f022009-05-19 18:01:42 +0200656 int len2 = strlen(a) + 2;
657 if (col >= (int)output_width - len2) {
Denis Vlasenko79cedcb2008-04-08 21:13:28 +0000658 full_write2_str(",\n");
Denis Vlasenko724d1962007-10-10 14:41:07 +0000659 col = 0;
660 }
Denys Vlasenko0149f022009-05-19 18:01:42 +0200661 if (col == 0) {
662 col = 6;
663 full_write2_str("\t");
664 } else {
665 full_write2_str(", ");
666 }
Denis Vlasenko79cedcb2008-04-08 21:13:28 +0000667 full_write2_str(a);
Denys Vlasenko0149f022009-05-19 18:01:42 +0200668 col += len2;
669 a += len2 - 1;
Denis Vlasenko724d1962007-10-10 14:41:07 +0000670 }
Denis Vlasenko79cedcb2008-04-08 21:13:28 +0000671 full_write2_str("\n\n");
Denis Vlasenko724d1962007-10-10 14:41:07 +0000672 return 0;
673 }
674
Denys Vlasenko8dff01d2015-03-12 17:48:34 +0100675 if (is_prefixed_with(argv[1], "--list")) {
Denys Vlasenko5a7c7202010-04-20 21:02:57 -0400676 unsigned i = 0;
677 const char *a = applet_names;
678 dup2(1, 2);
679 while (*a) {
Denys Vlasenko8f0af3b2010-11-29 02:55:35 +0100680# if ENABLE_FEATURE_INSTALLER
Denys Vlasenkoba888262012-03-22 11:15:06 +0100681 if (argv[1][6]) /* --list-full? */
Denys Vlasenko5a7c7202010-04-20 21:02:57 -0400682 full_write2_str(install_dir[APPLET_INSTALL_LOC(i)] + 1);
Denys Vlasenko8f0af3b2010-11-29 02:55:35 +0100683# endif
Denys Vlasenko5a7c7202010-04-20 21:02:57 -0400684 full_write2_str(a);
685 full_write2_str("\n");
686 i++;
687 a += strlen(a) + 1;
688 }
689 return 0;
690 }
691
Denis Vlasenko724d1962007-10-10 14:41:07 +0000692 if (ENABLE_FEATURE_INSTALLER && strcmp(argv[1], "--install") == 0) {
Denys Vlasenko3b405432009-07-15 00:35:34 +0200693 int use_symbolic_links;
Denis Vlasenko724d1962007-10-10 14:41:07 +0000694 const char *busybox;
Denys Vlasenko4a2a86d2011-03-06 06:02:31 +0100695
Denis Vlasenko724d1962007-10-10 14:41:07 +0000696 busybox = xmalloc_readlink(bb_busybox_exec_path);
Denys Vlasenko4a2a86d2011-03-06 06:02:31 +0100697 if (!busybox) {
698 /* bb_busybox_exec_path is usually "/proc/self/exe".
699 * In chroot, readlink("/proc/self/exe") usually fails.
700 * In such case, better use argv[0] as symlink target
701 * if it is a full path name.
702 */
Denys Vlasenko5c942712011-03-12 06:08:28 +0100703 if (argv[0][0] != '/')
704 bb_error_msg_and_die("'%s' is not an absolute path", argv[0]);
705 busybox = argv[0];
Denys Vlasenko4a2a86d2011-03-06 06:02:31 +0100706 }
707 /* busybox --install [-s] [DIR]:
708 * -s: make symlinks
709 * DIR: directory to install links to
710 */
Denys Vlasenkoba888262012-03-22 11:15:06 +0100711 use_symbolic_links = (argv[2] && strcmp(argv[2], "-s") == 0 && ++argv);
Denys Vlasenko3b405432009-07-15 00:35:34 +0200712 install_links(busybox, use_symbolic_links, argv[2]);
Denis Vlasenko724d1962007-10-10 14:41:07 +0000713 return 0;
714 }
715
716 if (strcmp(argv[1], "--help") == 0) {
717 /* "busybox --help [<applet>]" */
718 if (!argv[2])
719 goto help;
720 /* convert to "<applet> --help" */
721 argv[0] = argv[2];
722 argv[2] = NULL;
723 } else {
724 /* "busybox <applet> arg1 arg2 ..." */
725 argv++;
726 }
727 /* We support "busybox /a/path/to/applet args..." too. Allows for
728 * "#!/bin/busybox"-style wrappers */
729 applet_name = bb_get_last_path_component_nostrip(argv[0]);
730 run_applet_and_exit(applet_name, argv);
Denis Vlasenko79cedcb2008-04-08 21:13:28 +0000731
732 /*bb_error_msg_and_die("applet not found"); - sucks in printf */
733 full_write2_str(applet_name);
734 full_write2_str(": applet not found\n");
Denys Vlasenko628f1342014-11-17 17:03:47 +0100735 /* POSIX: "If a command is not found, the exit status shall be 127" */
736 exit(127);
Denis Vlasenko724d1962007-10-10 14:41:07 +0000737}
738
Denis Vlasenkodefc1ea2008-06-27 02:52:20 +0000739void FAST_FUNC run_applet_no_and_exit(int applet_no, char **argv)
Denis Vlasenko724d1962007-10-10 14:41:07 +0000740{
741 int argc = 1;
742
743 while (argv[argc])
744 argc++;
745
746 /* Reinit some shared global data */
Denis Vlasenko724d1962007-10-10 14:41:07 +0000747 xfunc_error_retval = EXIT_FAILURE;
Denis Vlasenko1aa7e472007-11-28 06:49:03 +0000748 applet_name = APPLET_NAME(applet_no);
Denys Vlasenkocd7a38a2014-09-18 00:47:05 +0200749
Denys Vlasenkocd7a38a2014-09-18 00:47:05 +0200750 /* Special case. POSIX says "test --help"
751 * should be no different from e.g. "test --foo".
752 * Thus for "test", we skip --help check.
Denys Vlasenkode5edad2015-04-21 16:00:41 +0200753 * "true" and "false" are also special.
Denys Vlasenkocd7a38a2014-09-18 00:47:05 +0200754 */
Denys Vlasenkode5edad2015-04-21 16:00:41 +0200755 if (1
756#if defined APPLET_NO_test
757 && applet_no != APPLET_NO_test
Denys Vlasenkocd7a38a2014-09-18 00:47:05 +0200758#endif
Denys Vlasenkode5edad2015-04-21 16:00:41 +0200759#if defined APPLET_NO_true
760 && applet_no != APPLET_NO_true
761#endif
Denys Vlasenkocd7a38a2014-09-18 00:47:05 +0200762#if defined APPLET_NO_false
Denys Vlasenkode5edad2015-04-21 16:00:41 +0200763 && applet_no != APPLET_NO_false
Denys Vlasenkocd7a38a2014-09-18 00:47:05 +0200764#endif
Denys Vlasenkode5edad2015-04-21 16:00:41 +0200765 ) {
766 if (argc == 2 && strcmp(argv[1], "--help") == 0) {
767 /* Make "foo --help" exit with 0: */
768 xfunc_error_retval = 0;
Denis Vlasenkobd28f6b2008-07-19 08:15:13 +0000769 bb_show_usage();
Denys Vlasenko5d783552013-01-17 11:02:21 +0100770 }
Denis Vlasenkobd28f6b2008-07-19 08:15:13 +0000771 }
Denis Vlasenko724d1962007-10-10 14:41:07 +0000772 if (ENABLE_FEATURE_SUID)
Denis Vlasenko1aa7e472007-11-28 06:49:03 +0000773 check_suid(applet_no);
Denis Vlasenko745cd172007-11-29 03:31:20 +0000774 exit(applet_main[applet_no](argc, argv));
Denis Vlasenko724d1962007-10-10 14:41:07 +0000775}
776
Denis Vlasenkodefc1ea2008-06-27 02:52:20 +0000777void FAST_FUNC run_applet_and_exit(const char *name, char **argv)
Denis Vlasenko724d1962007-10-10 14:41:07 +0000778{
Denis Vlasenko1aa7e472007-11-28 06:49:03 +0000779 int applet = find_applet_by_name(name);
780 if (applet >= 0)
781 run_applet_no_and_exit(applet, argv);
Denys Vlasenko8dff01d2015-03-12 17:48:34 +0100782 if (is_prefixed_with(name, "busybox"))
Denis Vlasenko724d1962007-10-10 14:41:07 +0000783 exit(busybox_main(argv));
784}
785
Denis Vlasenko10f6fb12008-04-29 00:10:27 +0000786#endif /* !defined(SINGLE_APPLET_MAIN) */
Denis Vlasenko468aea22008-04-01 14:47:57 +0000787
788
Denis Vlasenko724d1962007-10-10 14:41:07 +0000789
790#if ENABLE_BUILD_LIBBUSYBOX
Denis Vlasenko85c24712008-03-17 09:04:04 +0000791int lbb_main(char **argv)
Denis Vlasenko724d1962007-10-10 14:41:07 +0000792#else
Denis Vlasenkoa60f84e2008-07-05 09:18:54 +0000793int main(int argc UNUSED_PARAM, char **argv)
Denis Vlasenko724d1962007-10-10 14:41:07 +0000794#endif
795{
Denys Vlasenko1f7c1672009-09-06 02:12:28 +0200796 /* Tweak malloc for reduced memory consumption */
Denys Vlasenko1f7c1672009-09-06 02:12:28 +0200797#ifdef M_TRIM_THRESHOLD
798 /* M_TRIM_THRESHOLD is the maximum amount of freed top-most memory
799 * to keep before releasing to the OS
800 * Default is way too big: 256k
801 */
Denys Vlasenkofe86d6b2011-06-03 21:39:42 +0200802 mallopt(M_TRIM_THRESHOLD, 8 * 1024);
Denys Vlasenko1f7c1672009-09-06 02:12:28 +0200803#endif
804#ifdef M_MMAP_THRESHOLD
805 /* M_MMAP_THRESHOLD is the request size threshold for using mmap()
806 * Default is too big: 256k
807 */
Denys Vlasenkofe86d6b2011-06-03 21:39:42 +0200808 mallopt(M_MMAP_THRESHOLD, 32 * 1024 - 256);
Denys Vlasenko1f7c1672009-09-06 02:12:28 +0200809#endif
810
Denis Vlasenko724d1962007-10-10 14:41:07 +0000811#if !BB_MMU
812 /* NOMMU re-exec trick sets high-order bit in first byte of name */
813 if (argv[0][0] & 0x80) {
814 re_execed = 1;
815 argv[0][0] &= 0x7f;
816 }
817#endif
Denys Vlasenko8f0af3b2010-11-29 02:55:35 +0100818
819#if defined(SINGLE_APPLET_MAIN)
820 /* Only one applet is selected in .config */
Denys Vlasenko8dff01d2015-03-12 17:48:34 +0100821 if (argv[1] && is_prefixed_with(argv[0], "busybox")) {
Denys Vlasenko8f0af3b2010-11-29 02:55:35 +0100822 /* "busybox <applet> <params>" should still work as expected */
823 argv++;
824 }
825 /* applet_names in this case is just "applet\0\0" */
826 lbb_prepare(applet_names IF_FEATURE_INDIVIDUAL(, argv));
827 return SINGLE_APPLET_MAIN(argc, argv);
828#else
829 lbb_prepare("busybox" IF_FEATURE_INDIVIDUAL(, argv));
830
Denis Vlasenko724d1962007-10-10 14:41:07 +0000831 applet_name = argv[0];
832 if (applet_name[0] == '-')
833 applet_name++;
834 applet_name = bb_basename(applet_name);
835
836 parse_config_file(); /* ...maybe, if FEATURE_SUID_CONFIG */
837
838 run_applet_and_exit(applet_name, argv);
Denis Vlasenko79cedcb2008-04-08 21:13:28 +0000839
840 /*bb_error_msg_and_die("applet not found"); - sucks in printf */
841 full_write2_str(applet_name);
842 full_write2_str(": applet not found\n");
Denys Vlasenko628f1342014-11-17 17:03:47 +0100843 /* POSIX: "If a command is not found, the exit status shall be 127" */
844 exit(127);
Denis Vlasenko468aea22008-04-01 14:47:57 +0000845#endif
Denis Vlasenko724d1962007-10-10 14:41:07 +0000846}