Denis Vlasenko | ac7d0e3 | 2007-10-08 19:32:12 +0000 | [diff] [blame] | 1 | /* vi: set sw=4 ts=4: */ |
| 2 | /* |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 3 | * Utility routines. |
Denis Vlasenko | ac7d0e3 | 2007-10-08 19:32:12 +0000 | [diff] [blame] | 4 | * |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 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. |
Denis Vlasenko | ac7d0e3 | 2007-10-08 19:32:12 +0000 | [diff] [blame] | 8 | * |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 9 | * Based in part on code from sash, Copyright (c) 1999 by David I. Bell |
Denys Vlasenko | 0ef64bd | 2010-08-16 20:14:46 +0200 | [diff] [blame] | 10 | * Permission has been granted to redistribute this code under GPL. |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 11 | * |
Denys Vlasenko | 0ef64bd | 2010-08-16 20:14:46 +0200 | [diff] [blame] | 12 | * Licensed under GPLv2 or later, see file LICENSE in this source tree. |
Denis Vlasenko | ac7d0e3 | 2007-10-08 19:32:12 +0000 | [diff] [blame] | 13 | */ |
| 14 | |
Denis Vlasenko | 79cedcb | 2008-04-08 21:13:28 +0000 | [diff] [blame] | 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 | */ |
Denys Vlasenko | c1947f1 | 2009-10-23 01:30:26 +0200 | [diff] [blame] | 29 | #include "busybox.h" |
Denys Vlasenko | 9be4702 | 2011-05-16 12:21:31 +0200 | [diff] [blame] | 30 | |
Denys Vlasenko | 8da415e | 2010-12-05 01:30:14 +0100 | [diff] [blame] | 31 | #if !(defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__NetBSD__) \ |
Denys Vlasenko | 982e87f | 2013-07-30 11:52:58 +0200 | [diff] [blame] | 32 | || defined(__APPLE__) \ |
Denys Vlasenko | 8da415e | 2010-12-05 01:30:14 +0100 | [diff] [blame] | 33 | ) |
| 34 | # include <malloc.h> /* for mallopt */ |
| 35 | #endif |
Denys Vlasenko | 9be4702 | 2011-05-16 12:21:31 +0200 | [diff] [blame] | 36 | |
Denis Vlasenko | ac7d0e3 | 2007-10-08 19:32:12 +0000 | [diff] [blame] | 37 | |
| 38 | /* Declare <applet>_main() */ |
| 39 | #define PROTOTYPES |
| 40 | #include "applets.h" |
| 41 | #undef PROTOTYPES |
| 42 | |
Denis Vlasenko | 32b2a9f | 2008-02-22 22:43:22 +0000 | [diff] [blame] | 43 | /* Include generated applet names, pointers to <applet>_main, etc */ |
Denis Vlasenko | 1aa7e47 | 2007-11-28 06:49:03 +0000 | [diff] [blame] | 44 | #include "applet_tables.h" |
Denis Vlasenko | 468aea2 | 2008-04-01 14:47:57 +0000 | [diff] [blame] | 45 | /* ...and if applet_tables generator says we have only one applet... */ |
| 46 | #ifdef SINGLE_APPLET_MAIN |
Denys Vlasenko | 0e5ba08 | 2010-06-05 23:11:07 +0200 | [diff] [blame] | 47 | # undef ENABLE_FEATURE_INDIVIDUAL |
| 48 | # define ENABLE_FEATURE_INDIVIDUAL 1 |
| 49 | # undef IF_FEATURE_INDIVIDUAL |
| 50 | # define IF_FEATURE_INDIVIDUAL(...) __VA_ARGS__ |
Denis Vlasenko | 468aea2 | 2008-04-01 14:47:57 +0000 | [diff] [blame] | 51 | #endif |
Denis Vlasenko | ac7d0e3 | 2007-10-08 19:32:12 +0000 | [diff] [blame] | 52 | |
Denys Vlasenko | 0e5ba08 | 2010-06-05 23:11:07 +0200 | [diff] [blame] | 53 | #include "usage_compressed.h" |
| 54 | |
Denys Vlasenko | fe93624 | 2017-01-06 19:16:36 +0100 | [diff] [blame^] | 55 | |
| 56 | /* "Do not compress usage text if uncompressed text is small |
| 57 | * and we don't include bunzip2 code for other reasons" |
| 58 | * |
| 59 | * Useful for mass one-applet rebuild (bunzip2 code is ~2.7k). |
| 60 | * |
| 61 | * Unlike BUNZIP2, if FEATURE_SEAMLESS_BZ2 is on, bunzip2 code is built but |
| 62 | * still may be unused if none of the selected applets calls open_zipped() |
| 63 | * or its friends; we test for (FEATURE_SEAMLESS_BZ2 && <APPLET>) instead. |
| 64 | * For example, only if TAR and FEATURE_SEAMLESS_BZ2 are both selected, |
| 65 | * then bunzip2 code will be linked in anyway, and disabling help compression |
| 66 | * would be not optimal: |
| 67 | */ |
| 68 | #if UNPACKED_USAGE_LENGTH < 4*1024 \ |
| 69 | && !(ENABLE_FEATURE_SEAMLESS_BZ2 && ENABLE_TAR) \ |
| 70 | && !(ENABLE_FEATURE_SEAMLESS_BZ2 && ENABLE_MODPROBE) \ |
| 71 | && !(ENABLE_FEATURE_SEAMLESS_BZ2 && ENABLE_INSMOD) \ |
| 72 | && !(ENABLE_FEATURE_SEAMLESS_BZ2 && ENABLE_DEPMOD) \ |
| 73 | && !(ENABLE_FEATURE_SEAMLESS_BZ2 && ENABLE_MAN) \ |
| 74 | && !ENABLE_BUNZIP2 \ |
| 75 | && !ENABLE_BZCAT |
| 76 | # undef ENABLE_FEATURE_COMPRESS_USAGE |
| 77 | # define ENABLE_FEATURE_COMPRESS_USAGE 0 |
| 78 | #endif |
| 79 | |
| 80 | |
Denys Vlasenko | 0e5ba08 | 2010-06-05 23:11:07 +0200 | [diff] [blame] | 81 | #if ENABLE_SHOW_USAGE && !ENABLE_FEATURE_COMPRESS_USAGE |
| 82 | static const char usage_messages[] ALIGN1 = UNPACKED_USAGE; |
| 83 | #else |
| 84 | # define usage_messages 0 |
Denys Vlasenko | 1fcbff2 | 2010-06-26 02:40:08 +0200 | [diff] [blame] | 85 | #endif |
Denys Vlasenko | 0e5ba08 | 2010-06-05 23:11:07 +0200 | [diff] [blame] | 86 | |
Denis Vlasenko | ac7d0e3 | 2007-10-08 19:32:12 +0000 | [diff] [blame] | 87 | #if ENABLE_FEATURE_COMPRESS_USAGE |
| 88 | |
Denys Vlasenko | 5c296de | 2010-07-03 14:28:35 +0200 | [diff] [blame] | 89 | static const char packed_usage[] ALIGN1 = { PACKED_USAGE }; |
Denys Vlasenko | d184a72 | 2011-09-22 12:45:14 +0200 | [diff] [blame] | 90 | # include "bb_archive.h" |
Denis Vlasenko | ac7d0e3 | 2007-10-08 19:32:12 +0000 | [diff] [blame] | 91 | static const char *unpack_usage_messages(void) |
| 92 | { |
| 93 | char *outbuf = NULL; |
| 94 | bunzip_data *bd; |
| 95 | int i; |
| 96 | |
| 97 | i = start_bunzip(&bd, |
| 98 | /* src_fd: */ -1, |
Denys Vlasenko | caddfc8 | 2010-10-28 23:08:53 +0200 | [diff] [blame] | 99 | /* inbuf: */ packed_usage, |
Denis Vlasenko | ac7d0e3 | 2007-10-08 19:32:12 +0000 | [diff] [blame] | 100 | /* len: */ sizeof(packed_usage)); |
| 101 | /* read_bunzip can longjmp to start_bunzip, and ultimately |
| 102 | * end up here with i != 0 on read data errors! Not trivial */ |
| 103 | if (!i) { |
| 104 | /* Cannot use xmalloc: will leak bd in NOFORK case! */ |
Denys Vlasenko | 0e5ba08 | 2010-06-05 23:11:07 +0200 | [diff] [blame] | 105 | outbuf = malloc_or_warn(sizeof(UNPACKED_USAGE)); |
Denis Vlasenko | ac7d0e3 | 2007-10-08 19:32:12 +0000 | [diff] [blame] | 106 | if (outbuf) |
Denys Vlasenko | 0e5ba08 | 2010-06-05 23:11:07 +0200 | [diff] [blame] | 107 | read_bunzip(bd, outbuf, sizeof(UNPACKED_USAGE)); |
Denis Vlasenko | ac7d0e3 | 2007-10-08 19:32:12 +0000 | [diff] [blame] | 108 | } |
| 109 | dealloc_bunzip(bd); |
| 110 | return outbuf; |
| 111 | } |
Denys Vlasenko | 0e5ba08 | 2010-06-05 23:11:07 +0200 | [diff] [blame] | 112 | # define dealloc_usage_messages(s) free(s) |
Denis Vlasenko | ac7d0e3 | 2007-10-08 19:32:12 +0000 | [diff] [blame] | 113 | |
| 114 | #else |
| 115 | |
Denys Vlasenko | 0e5ba08 | 2010-06-05 23:11:07 +0200 | [diff] [blame] | 116 | # define unpack_usage_messages() usage_messages |
| 117 | # define dealloc_usage_messages(s) ((void)(s)) |
Denis Vlasenko | ac7d0e3 | 2007-10-08 19:32:12 +0000 | [diff] [blame] | 118 | |
| 119 | #endif /* FEATURE_COMPRESS_USAGE */ |
| 120 | |
| 121 | |
Denis Vlasenko | defc1ea | 2008-06-27 02:52:20 +0000 | [diff] [blame] | 122 | void FAST_FUNC bb_show_usage(void) |
Denis Vlasenko | ac7d0e3 | 2007-10-08 19:32:12 +0000 | [diff] [blame] | 123 | { |
| 124 | if (ENABLE_SHOW_USAGE) { |
Denis Vlasenko | 468aea2 | 2008-04-01 14:47:57 +0000 | [diff] [blame] | 125 | #ifdef SINGLE_APPLET_STR |
| 126 | /* Imagine that this applet is "true". Dont suck in printf! */ |
Lauri Kasanen | 2b662c5 | 2010-11-13 23:16:05 +0100 | [diff] [blame] | 127 | const char *usage_string = unpack_usage_messages(); |
Denis Vlasenko | 468aea2 | 2008-04-01 14:47:57 +0000 | [diff] [blame] | 128 | |
Lauri Kasanen | 2b662c5 | 2010-11-13 23:16:05 +0100 | [diff] [blame] | 129 | if (*usage_string == '\b') { |
Denis Vlasenko | 4240408 | 2008-11-24 13:42:24 +0000 | [diff] [blame] | 130 | full_write2_str("No help available.\n\n"); |
Denis Vlasenko | 468aea2 | 2008-04-01 14:47:57 +0000 | [diff] [blame] | 131 | } else { |
Denis Vlasenko | 4240408 | 2008-11-24 13:42:24 +0000 | [diff] [blame] | 132 | full_write2_str("Usage: "SINGLE_APPLET_STR" "); |
Lauri Kasanen | 2b662c5 | 2010-11-13 23:16:05 +0100 | [diff] [blame] | 133 | full_write2_str(usage_string); |
Denis Vlasenko | 79cedcb | 2008-04-08 21:13:28 +0000 | [diff] [blame] | 134 | full_write2_str("\n\n"); |
Denis Vlasenko | 468aea2 | 2008-04-01 14:47:57 +0000 | [diff] [blame] | 135 | } |
Denys Vlasenko | 630dde1 | 2009-08-30 19:57:49 +0200 | [diff] [blame] | 136 | if (ENABLE_FEATURE_CLEAN_UP) |
| 137 | dealloc_usage_messages((char*)usage_string); |
Denis Vlasenko | 468aea2 | 2008-04-01 14:47:57 +0000 | [diff] [blame] | 138 | #else |
Denis Vlasenko | ac7d0e3 | 2007-10-08 19:32:12 +0000 | [diff] [blame] | 139 | const char *p; |
| 140 | const char *usage_string = p = unpack_usage_messages(); |
Denis Vlasenko | 1aa7e47 | 2007-11-28 06:49:03 +0000 | [diff] [blame] | 141 | int ap = find_applet_by_name(applet_name); |
Denis Vlasenko | ac7d0e3 | 2007-10-08 19:32:12 +0000 | [diff] [blame] | 142 | |
Denis Vlasenko | 1aa7e47 | 2007-11-28 06:49:03 +0000 | [diff] [blame] | 143 | if (ap < 0) /* never happens, paranoia */ |
Denis Vlasenko | ac7d0e3 | 2007-10-08 19:32:12 +0000 | [diff] [blame] | 144 | xfunc_die(); |
Denis Vlasenko | 1aa7e47 | 2007-11-28 06:49:03 +0000 | [diff] [blame] | 145 | while (ap) { |
Denis Vlasenko | ac7d0e3 | 2007-10-08 19:32:12 +0000 | [diff] [blame] | 146 | while (*p++) continue; |
Denis Vlasenko | 1aa7e47 | 2007-11-28 06:49:03 +0000 | [diff] [blame] | 147 | ap--; |
Denis Vlasenko | ac7d0e3 | 2007-10-08 19:32:12 +0000 | [diff] [blame] | 148 | } |
Denis Vlasenko | 79cedcb | 2008-04-08 21:13:28 +0000 | [diff] [blame] | 149 | full_write2_str(bb_banner); |
Denys Vlasenko | 630dde1 | 2009-08-30 19:57:49 +0200 | [diff] [blame] | 150 | full_write2_str(" multi-call binary.\n"); |
Denis Vlasenko | ac7d0e3 | 2007-10-08 19:32:12 +0000 | [diff] [blame] | 151 | if (*p == '\b') |
Denis Vlasenko | 79cedcb | 2008-04-08 21:13:28 +0000 | [diff] [blame] | 152 | full_write2_str("\nNo help available.\n\n"); |
| 153 | else { |
| 154 | full_write2_str("\nUsage: "); |
| 155 | full_write2_str(applet_name); |
| 156 | full_write2_str(" "); |
| 157 | full_write2_str(p); |
Denys Vlasenko | 7f4a49a | 2015-05-25 14:30:52 +0200 | [diff] [blame] | 158 | full_write2_str("\n"); |
Denis Vlasenko | 79cedcb | 2008-04-08 21:13:28 +0000 | [diff] [blame] | 159 | } |
Denys Vlasenko | 630dde1 | 2009-08-30 19:57:49 +0200 | [diff] [blame] | 160 | if (ENABLE_FEATURE_CLEAN_UP) |
| 161 | dealloc_usage_messages((char*)usage_string); |
Denis Vlasenko | 468aea2 | 2008-04-01 14:47:57 +0000 | [diff] [blame] | 162 | #endif |
Denis Vlasenko | ac7d0e3 | 2007-10-08 19:32:12 +0000 | [diff] [blame] | 163 | } |
| 164 | xfunc_die(); |
| 165 | } |
| 166 | |
Denis Vlasenko | defc1ea | 2008-06-27 02:52:20 +0000 | [diff] [blame] | 167 | int FAST_FUNC find_applet_by_name(const char *name) |
Denis Vlasenko | ac7d0e3 | 2007-10-08 19:32:12 +0000 | [diff] [blame] | 168 | { |
Ron Yorston | b220617 | 2016-04-03 22:29:35 +0200 | [diff] [blame] | 169 | unsigned i, max; |
| 170 | int j; |
Denis Vlasenko | 745cd17 | 2007-11-29 03:31:20 +0000 | [diff] [blame] | 171 | const char *p; |
Ron Yorston | 610c4c3 | 2016-03-30 00:42:05 +0200 | [diff] [blame] | 172 | |
Denys Vlasenko | a93e4fd | 2016-04-02 22:54:23 +0200 | [diff] [blame] | 173 | /* The commented-out word-at-a-time code is ~40% faster, but +160 bytes. |
| 174 | * "Faster" here saves ~0.5 microsecond of real time - not worth it. |
| 175 | */ |
| 176 | #if 0 /*BB_UNALIGNED_MEMACCESS_OK && BB_LITTLE_ENDIAN*/ |
| 177 | uint32_t n32; |
| 178 | |
| 179 | /* Handle all names < 2 chars long early */ |
| 180 | if (name[0] == '\0') |
| 181 | return -1; /* "" is not a valid applet name */ |
| 182 | if (name[1] == '\0') { |
| 183 | if (!ENABLE_TEST) |
| 184 | return -1; /* 1-char name is not valid */ |
| 185 | if (name[0] != ']') |
| 186 | return -1; /* 1-char name which isn't "[" is not valid */ |
| 187 | /* applet "[" is always applet #0: */ |
| 188 | return 0; |
| 189 | } |
| 190 | #endif |
| 191 | |
Ron Yorston | 610c4c3 | 2016-03-30 00:42:05 +0200 | [diff] [blame] | 192 | p = applet_names; |
| 193 | i = 0; |
| 194 | #if KNOWN_APPNAME_OFFSETS <= 0 |
| 195 | max = NUM_APPLETS; |
Denis Vlasenko | 79cedcb | 2008-04-08 21:13:28 +0000 | [diff] [blame] | 196 | #else |
Ron Yorston | 610c4c3 | 2016-03-30 00:42:05 +0200 | [diff] [blame] | 197 | max = NUM_APPLETS * KNOWN_APPNAME_OFFSETS; |
| 198 | for (j = ARRAY_SIZE(applet_nameofs)-1; j >= 0; j--) { |
| 199 | const char *pp = applet_names + applet_nameofs[j]; |
| 200 | if (strcmp(name, pp) >= 0) { |
| 201 | //bb_error_msg("name:'%s' >= pp:'%s'", name, pp); |
| 202 | p = pp; |
| 203 | i = max - NUM_APPLETS; |
| 204 | break; |
| 205 | } |
| 206 | max -= NUM_APPLETS; |
| 207 | } |
| 208 | max /= (unsigned)KNOWN_APPNAME_OFFSETS; |
| 209 | i /= (unsigned)KNOWN_APPNAME_OFFSETS; |
| 210 | //bb_error_msg("name:'%s' starting from:'%s' i:%u max:%u", name, p, i, max); |
| 211 | #endif |
| 212 | |
Denys Vlasenko | 1cf68e3 | 2016-04-02 22:57:17 +0200 | [diff] [blame] | 213 | /* Open-coded linear search without strcmp/strlen calls for speed */ |
Denys Vlasenko | a93e4fd | 2016-04-02 22:54:23 +0200 | [diff] [blame] | 214 | |
| 215 | #if 0 /*BB_UNALIGNED_MEMACCESS_OK && BB_LITTLE_ENDIAN*/ |
| 216 | /* skip "[\0" name, it's surely not it */ |
| 217 | if (ENABLE_TEST && LONE_CHAR(p, '[')) |
| 218 | i++, p += 2; |
| 219 | /* All remaining applet names in p[] are at least 2 chars long */ |
| 220 | /* name[] is also at least 2 chars long */ |
| 221 | |
| 222 | n32 = (name[0] << 0) | (name[1] << 8) | (name[2] << 16); |
| 223 | while (i < max) { |
| 224 | uint32_t p32; |
| 225 | char ch; |
| 226 | |
| 227 | /* Quickly check match of the first 3 bytes */ |
| 228 | move_from_unaligned32(p32, p); |
| 229 | p += 3; |
| 230 | if ((p32 & 0x00ffffff) != n32) { |
| 231 | /* Most likely case: 3 first bytes do not match */ |
| 232 | i++; |
| 233 | if ((p32 & 0x00ff0000) == '\0') |
| 234 | continue; // p[2] was NUL |
| 235 | p++; |
| 236 | if ((p32 & 0xff000000) == '\0') |
| 237 | continue; // p[3] was NUL |
| 238 | /* p[0..3] aren't matching and none is NUL, check the rest */ |
| 239 | while (*p++ != '\0') |
| 240 | continue; |
| 241 | continue; |
| 242 | } |
| 243 | |
| 244 | /* Unlikely branch: first 3 bytes ([0..2]) match */ |
| 245 | if ((p32 & 0x00ff0000) == '\0') { |
| 246 | /* name is 2-byte long, it is full match */ |
| 247 | //bb_error_msg("found:'%s' i:%u", name, i); |
| 248 | return i; |
| 249 | } |
| 250 | /* Check remaining bytes [3..NUL] */ |
| 251 | ch = (p32 >> 24); |
| 252 | j = 3; |
| 253 | while (ch == name[j]) { |
| 254 | if (ch == '\0') { |
| 255 | //bb_error_msg("found:'%s' i:%u", name, i); |
| 256 | return i; |
| 257 | } |
| 258 | ch = *++p; |
| 259 | j++; |
| 260 | } |
| 261 | /* Not a match. Skip it, including NUL */ |
| 262 | while (ch != '\0') |
| 263 | ch = *++p; |
| 264 | p++; |
| 265 | i++; |
| 266 | } |
| 267 | return -1; |
| 268 | #else |
Ron Yorston | 610c4c3 | 2016-03-30 00:42:05 +0200 | [diff] [blame] | 269 | while (i < max) { |
| 270 | char ch; |
| 271 | j = 0; |
| 272 | /* Do we see "name\0" in applet_names[p] position? */ |
| 273 | while ((ch = *p) == name[j]) { |
| 274 | if (ch == '\0') { |
| 275 | //bb_error_msg("found:'%s' i:%u", name, i); |
| 276 | return i; /* yes */ |
| 277 | } |
| 278 | p++; |
| 279 | j++; |
| 280 | } |
| 281 | /* No. |
| 282 | * p => 1st non-matching char in applet_names[], |
| 283 | * skip to and including NUL. |
| 284 | */ |
| 285 | while (ch != '\0') |
| 286 | ch = *++p; |
| 287 | p++; |
Denis Vlasenko | 79cedcb | 2008-04-08 21:13:28 +0000 | [diff] [blame] | 288 | i++; |
| 289 | } |
| 290 | return -1; |
Denys Vlasenko | a93e4fd | 2016-04-02 22:54:23 +0200 | [diff] [blame] | 291 | #endif |
Denis Vlasenko | ac7d0e3 | 2007-10-08 19:32:12 +0000 | [diff] [blame] | 292 | } |
| 293 | |
| 294 | |
Denis Vlasenko | 68404f1 | 2008-03-17 09:00:54 +0000 | [diff] [blame] | 295 | void lbb_prepare(const char *applet |
Denis Vlasenko | 5e34ff2 | 2009-04-21 11:09:40 +0000 | [diff] [blame] | 296 | IF_FEATURE_INDIVIDUAL(, char **argv)) |
Denis Vlasenko | 468aea2 | 2008-04-01 14:47:57 +0000 | [diff] [blame] | 297 | MAIN_EXTERNALLY_VISIBLE; |
| 298 | void lbb_prepare(const char *applet |
Denis Vlasenko | 5e34ff2 | 2009-04-21 11:09:40 +0000 | [diff] [blame] | 299 | IF_FEATURE_INDIVIDUAL(, char **argv)) |
Denis Vlasenko | ac7d0e3 | 2007-10-08 19:32:12 +0000 | [diff] [blame] | 300 | { |
| 301 | #ifdef __GLIBC__ |
| 302 | (*(int **)&bb_errno) = __errno_location(); |
Denis Vlasenko | 574f2f4 | 2008-02-27 18:41:59 +0000 | [diff] [blame] | 303 | barrier(); |
Denis Vlasenko | ac7d0e3 | 2007-10-08 19:32:12 +0000 | [diff] [blame] | 304 | #endif |
Denis Vlasenko | 15cb4a4 | 2007-10-11 10:06:26 +0000 | [diff] [blame] | 305 | applet_name = applet; |
Denis Vlasenko | ac7d0e3 | 2007-10-08 19:32:12 +0000 | [diff] [blame] | 306 | |
Denys Vlasenko | 45b4ecc | 2014-08-11 20:33:18 +0200 | [diff] [blame] | 307 | if (ENABLE_LOCALE_SUPPORT) |
Denis Vlasenko | ac7d0e3 | 2007-10-08 19:32:12 +0000 | [diff] [blame] | 308 | setlocale(LC_ALL, ""); |
| 309 | |
Denis Vlasenko | 82d38da | 2007-10-10 14:38:47 +0000 | [diff] [blame] | 310 | #if ENABLE_FEATURE_INDIVIDUAL |
| 311 | /* Redundant for busybox (run_applet_and_exit covers that case) |
| 312 | * but needed for "individual applet" mode */ |
Denys Vlasenko | 9297dbc | 2010-07-05 21:37:12 +0200 | [diff] [blame] | 313 | if (argv[1] |
| 314 | && !argv[2] |
| 315 | && strcmp(argv[1], "--help") == 0 |
Denys Vlasenko | 8dff01d | 2015-03-12 17:48:34 +0100 | [diff] [blame] | 316 | && !is_prefixed_with(applet, "busybox") |
Denys Vlasenko | 9297dbc | 2010-07-05 21:37:12 +0200 | [diff] [blame] | 317 | ) { |
Denis Vlasenko | bd28f6b | 2008-07-19 08:15:13 +0000 | [diff] [blame] | 318 | /* Special case. POSIX says "test --help" |
| 319 | * should be no different from e.g. "test --foo". */ |
| 320 | if (!ENABLE_TEST || strcmp(applet_name, "test") != 0) |
| 321 | bb_show_usage(); |
| 322 | } |
Denis Vlasenko | 82d38da | 2007-10-10 14:38:47 +0000 | [diff] [blame] | 323 | #endif |
Denis Vlasenko | ac7d0e3 | 2007-10-08 19:32:12 +0000 | [diff] [blame] | 324 | } |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 325 | |
| 326 | /* The code below can well be in applets/applets.c, as it is used only |
| 327 | * for busybox binary, not "individual" binaries. |
| 328 | * However, keeping it here and linking it into libbusybox.so |
| 329 | * (together with remaining tiny applets/applets.o) |
| 330 | * makes it possible to avoid --whole-archive at link time. |
| 331 | * This makes (shared busybox) + libbusybox smaller. |
| 332 | * (--gc-sections would be even better....) |
| 333 | */ |
| 334 | |
| 335 | const char *applet_name; |
| 336 | #if !BB_MMU |
| 337 | bool re_execed; |
| 338 | #endif |
| 339 | |
Denis Vlasenko | 468aea2 | 2008-04-01 14:47:57 +0000 | [diff] [blame] | 340 | |
Denis Vlasenko | 10f6fb1 | 2008-04-29 00:10:27 +0000 | [diff] [blame] | 341 | /* If not built as a single-applet executable... */ |
| 342 | #if !defined(SINGLE_APPLET_MAIN) |
Denis Vlasenko | 468aea2 | 2008-04-01 14:47:57 +0000 | [diff] [blame] | 343 | |
Denis Vlasenko | 5e34ff2 | 2009-04-21 11:09:40 +0000 | [diff] [blame] | 344 | IF_FEATURE_SUID(static uid_t ruid;) /* real uid */ |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 345 | |
Denys Vlasenko | 8f0af3b | 2010-11-29 02:55:35 +0100 | [diff] [blame] | 346 | # if ENABLE_FEATURE_SUID_CONFIG |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 347 | |
Denys Vlasenko | 9be4702 | 2011-05-16 12:21:31 +0200 | [diff] [blame] | 348 | static struct suid_config_t { |
| 349 | /* next ptr must be first: this struct needs to be llist-compatible */ |
| 350 | struct suid_config_t *m_next; |
Denys Vlasenko | 4566e17 | 2011-05-16 00:01:08 +0200 | [diff] [blame] | 351 | struct bb_uidgid_t m_ugid; |
Denys Vlasenko | 9be4702 | 2011-05-16 12:21:31 +0200 | [diff] [blame] | 352 | int m_applet; |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 353 | mode_t m_mode; |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 354 | } *suid_config; |
| 355 | |
| 356 | static bool suid_cfg_readable; |
| 357 | |
Denys Vlasenko | d83aff1 | 2011-05-16 13:53:19 +0200 | [diff] [blame] | 358 | /* libbb candidate */ |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 359 | static char *get_trimmed_slice(char *s, char *e) |
| 360 | { |
| 361 | /* First, consider the value at e to be nul and back up until we |
| 362 | * reach a non-space char. Set the char after that (possibly at |
| 363 | * the original e) to nul. */ |
| 364 | while (e-- > s) { |
| 365 | if (!isspace(*e)) { |
| 366 | break; |
| 367 | } |
| 368 | } |
| 369 | e[1] = '\0'; |
| 370 | |
| 371 | /* Next, advance past all leading space and return a ptr to the |
| 372 | * first non-space char; possibly the terminating nul. */ |
| 373 | return skip_whitespace(s); |
| 374 | } |
| 375 | |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 376 | static void parse_config_file(void) |
| 377 | { |
Denys Vlasenko | 3770b6b | 2011-05-16 13:19:25 +0200 | [diff] [blame] | 378 | /* Don't depend on the tools to combine strings. */ |
| 379 | static const char config_file[] ALIGN1 = "/etc/busybox.conf"; |
| 380 | |
Denys Vlasenko | 9be4702 | 2011-05-16 12:21:31 +0200 | [diff] [blame] | 381 | struct suid_config_t *sct_head; |
Denis Vlasenko | 1aa7e47 | 2007-11-28 06:49:03 +0000 | [diff] [blame] | 382 | int applet_no; |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 383 | FILE *f; |
| 384 | const char *errmsg; |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 385 | unsigned lc; |
| 386 | smallint section; |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 387 | struct stat st; |
| 388 | |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 389 | ruid = getuid(); |
| 390 | if (ruid == 0) /* run by root - don't need to even read config file */ |
| 391 | return; |
| 392 | |
| 393 | if ((stat(config_file, &st) != 0) /* No config file? */ |
| 394 | || !S_ISREG(st.st_mode) /* Not a regular file? */ |
| 395 | || (st.st_uid != 0) /* Not owned by root? */ |
| 396 | || (st.st_mode & (S_IWGRP | S_IWOTH)) /* Writable by non-root? */ |
Denys Vlasenko | 4566e17 | 2011-05-16 00:01:08 +0200 | [diff] [blame] | 397 | || !(f = fopen_for_read(config_file)) /* Cannot open? */ |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 398 | ) { |
| 399 | return; |
| 400 | } |
| 401 | |
| 402 | suid_cfg_readable = 1; |
| 403 | sct_head = NULL; |
| 404 | section = lc = 0; |
| 405 | |
| 406 | while (1) { |
Denys Vlasenko | 9be4702 | 2011-05-16 12:21:31 +0200 | [diff] [blame] | 407 | char buffer[256]; |
| 408 | char *s; |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 409 | |
Denys Vlasenko | 9be4702 | 2011-05-16 12:21:31 +0200 | [diff] [blame] | 410 | if (!fgets(buffer, sizeof(buffer), f)) { /* Are we done? */ |
Denys Vlasenko | 4566e17 | 2011-05-16 00:01:08 +0200 | [diff] [blame] | 411 | // Looks like bloat |
| 412 | //if (ferror(f)) { /* Make sure it wasn't a read error. */ |
| 413 | // errmsg = "reading"; |
| 414 | // goto pe_label; |
| 415 | //} |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 416 | fclose(f); |
| 417 | suid_config = sct_head; /* Success, so set the pointer. */ |
| 418 | return; |
| 419 | } |
| 420 | |
Denys Vlasenko | 9be4702 | 2011-05-16 12:21:31 +0200 | [diff] [blame] | 421 | s = buffer; |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 422 | lc++; /* Got a (partial) line. */ |
| 423 | |
| 424 | /* If a line is too long for our buffer, we consider it an error. |
| 425 | * The following test does mistreat one corner case though. |
| 426 | * If the final line of the file does not end with a newline and |
| 427 | * yet exactly fills the buffer, it will be treated as too long |
| 428 | * even though there isn't really a problem. But it isn't really |
| 429 | * worth adding code to deal with such an unlikely situation, and |
| 430 | * we do err on the side of caution. Besides, the line would be |
| 431 | * too long if it did end with a newline. */ |
| 432 | if (!strchr(s, '\n') && !feof(f)) { |
Denys Vlasenko | 4566e17 | 2011-05-16 00:01:08 +0200 | [diff] [blame] | 433 | errmsg = "line too long"; |
| 434 | goto pe_label; |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 435 | } |
| 436 | |
| 437 | /* Trim leading and trailing whitespace, ignoring comments, and |
| 438 | * check if the resulting string is empty. */ |
| 439 | s = get_trimmed_slice(s, strchrnul(s, '#')); |
| 440 | if (!*s) { |
| 441 | continue; |
| 442 | } |
| 443 | |
| 444 | /* Check for a section header. */ |
| 445 | |
| 446 | if (*s == '[') { |
| 447 | /* Unlike the old code, we ignore leading and trailing |
| 448 | * whitespace for the section name. We also require that |
| 449 | * there are no stray characters after the closing bracket. */ |
Denys Vlasenko | 9be4702 | 2011-05-16 12:21:31 +0200 | [diff] [blame] | 450 | char *e = strchr(s, ']'); |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 451 | if (!e /* Missing right bracket? */ |
| 452 | || e[1] /* Trailing characters? */ |
| 453 | || !*(s = get_trimmed_slice(s+1, e)) /* Missing name? */ |
| 454 | ) { |
Denys Vlasenko | 4566e17 | 2011-05-16 00:01:08 +0200 | [diff] [blame] | 455 | errmsg = "section header"; |
| 456 | goto pe_label; |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 457 | } |
| 458 | /* Right now we only have one section so just check it. |
| 459 | * If more sections are added in the future, please don't |
| 460 | * resort to cascading ifs with multiple strcasecmp calls. |
| 461 | * That kind of bloated code is all too common. A loop |
| 462 | * and a string table would be a better choice unless the |
| 463 | * number of sections is very small. */ |
| 464 | if (strcasecmp(s, "SUID") == 0) { |
| 465 | section = 1; |
| 466 | continue; |
| 467 | } |
| 468 | section = -1; /* Unknown section so set to skip. */ |
| 469 | continue; |
| 470 | } |
| 471 | |
| 472 | /* Process sections. */ |
| 473 | |
| 474 | if (section == 1) { /* SUID */ |
| 475 | /* Since we trimmed leading and trailing space above, we're |
| 476 | * now looking for strings of the form |
| 477 | * <key>[::space::]*=[::space::]*<value> |
| 478 | * where both key and value could contain inner whitespace. */ |
| 479 | |
| 480 | /* First get the key (an applet name in our case). */ |
Denys Vlasenko | 9be4702 | 2011-05-16 12:21:31 +0200 | [diff] [blame] | 481 | char *e = strchr(s, '='); |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 482 | if (e) { |
| 483 | s = get_trimmed_slice(s, e); |
| 484 | } |
| 485 | if (!e || !*s) { /* Missing '=' or empty key. */ |
Denys Vlasenko | 4566e17 | 2011-05-16 00:01:08 +0200 | [diff] [blame] | 486 | errmsg = "keyword"; |
| 487 | goto pe_label; |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 488 | } |
| 489 | |
| 490 | /* Ok, we have an applet name. Process the rhs if this |
| 491 | * applet is currently built in and ignore it otherwise. |
| 492 | * Note: this can hide config file bugs which only pop |
| 493 | * up when the busybox configuration is changed. */ |
Denis Vlasenko | 1aa7e47 | 2007-11-28 06:49:03 +0000 | [diff] [blame] | 494 | applet_no = find_applet_by_name(s); |
| 495 | if (applet_no >= 0) { |
Denys Vlasenko | 3770b6b | 2011-05-16 13:19:25 +0200 | [diff] [blame] | 496 | unsigned i; |
Denys Vlasenko | 9be4702 | 2011-05-16 12:21:31 +0200 | [diff] [blame] | 497 | struct suid_config_t *sct; |
| 498 | |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 499 | /* Note: We currently don't check for duplicates! |
| 500 | * The last config line for each applet will be the |
| 501 | * one used since we insert at the head of the list. |
| 502 | * I suppose this could be considered a feature. */ |
Denys Vlasenko | 4566e17 | 2011-05-16 00:01:08 +0200 | [diff] [blame] | 503 | sct = xzalloc(sizeof(*sct)); |
Denis Vlasenko | 1aa7e47 | 2007-11-28 06:49:03 +0000 | [diff] [blame] | 504 | sct->m_applet = applet_no; |
Denys Vlasenko | 4566e17 | 2011-05-16 00:01:08 +0200 | [diff] [blame] | 505 | /*sct->m_mode = 0;*/ |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 506 | sct->m_next = sct_head; |
| 507 | sct_head = sct; |
| 508 | |
| 509 | /* Get the specified mode. */ |
| 510 | |
| 511 | e = skip_whitespace(e+1); |
| 512 | |
| 513 | for (i = 0; i < 3; i++) { |
Denys Vlasenko | 3770b6b | 2011-05-16 13:19:25 +0200 | [diff] [blame] | 514 | /* There are 4 chars for each of user/group/other. |
| 515 | * "x-xx" instead of "x-" are to make |
| 516 | * "idx > 3" check catch invalid chars. |
| 517 | */ |
| 518 | static const char mode_chars[] ALIGN1 = "Ssx-" "Ssx-" "x-xx"; |
| 519 | static const unsigned short mode_mask[] ALIGN2 = { |
| 520 | S_ISUID, S_ISUID|S_IXUSR, S_IXUSR, 0, /* Ssx- */ |
| 521 | S_ISGID, S_ISGID|S_IXGRP, S_IXGRP, 0, /* Ssx- */ |
| 522 | S_IXOTH, 0 /* x- */ |
| 523 | }; |
| 524 | const char *q = strchrnul(mode_chars + 4*i, *e); |
| 525 | unsigned idx = q - (mode_chars + 4*i); |
| 526 | if (idx > 3) { |
Denys Vlasenko | 4566e17 | 2011-05-16 00:01:08 +0200 | [diff] [blame] | 527 | errmsg = "mode"; |
| 528 | goto pe_label; |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 529 | } |
Denys Vlasenko | 3770b6b | 2011-05-16 13:19:25 +0200 | [diff] [blame] | 530 | sct->m_mode |= mode_mask[q - mode_chars]; |
| 531 | e++; |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 532 | } |
| 533 | |
Marek Polacek | b0b8884 | 2011-04-16 17:33:43 +0200 | [diff] [blame] | 534 | /* Now get the user/group info. */ |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 535 | |
| 536 | s = skip_whitespace(e); |
Denys Vlasenko | 351fec3 | 2011-05-16 14:30:26 +0200 | [diff] [blame] | 537 | /* Default is 0.0, else parse USER.GROUP: */ |
| 538 | if (*s) { |
| 539 | /* We require whitespace between mode and USER.GROUP */ |
| 540 | if ((s == e) || !(e = strchr(s, '.'))) { |
| 541 | errmsg = "uid.gid"; |
| 542 | goto pe_label; |
| 543 | } |
| 544 | *e = ':'; /* get_uidgid needs USER:GROUP syntax */ |
Denys Vlasenko | 526d858 | 2015-10-19 04:27:17 +0200 | [diff] [blame] | 545 | if (get_uidgid(&sct->m_ugid, s) == 0) { |
Denys Vlasenko | 351fec3 | 2011-05-16 14:30:26 +0200 | [diff] [blame] | 546 | errmsg = "unknown user/group"; |
| 547 | goto pe_label; |
| 548 | } |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 549 | } |
| 550 | } |
| 551 | continue; |
| 552 | } |
| 553 | |
| 554 | /* Unknown sections are ignored. */ |
| 555 | |
| 556 | /* Encountering configuration lines prior to seeing a |
| 557 | * section header is treated as an error. This is how |
| 558 | * the old code worked, but it may not be desirable. |
| 559 | * We may want to simply ignore such lines in case they |
| 560 | * are used in some future version of busybox. */ |
| 561 | if (!section) { |
Denys Vlasenko | 4566e17 | 2011-05-16 00:01:08 +0200 | [diff] [blame] | 562 | errmsg = "keyword outside section"; |
| 563 | goto pe_label; |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 564 | } |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 565 | } /* while (1) */ |
| 566 | |
| 567 | pe_label: |
Denys Vlasenko | 9be4702 | 2011-05-16 12:21:31 +0200 | [diff] [blame] | 568 | fclose(f); |
Denys Vlasenko | 4566e17 | 2011-05-16 00:01:08 +0200 | [diff] [blame] | 569 | bb_error_msg("parse error in %s, line %u: %s", config_file, lc, errmsg); |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 570 | |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 571 | /* Release any allocated memory before returning. */ |
Denys Vlasenko | 9be4702 | 2011-05-16 12:21:31 +0200 | [diff] [blame] | 572 | llist_free((llist_t*)sct_head, NULL); |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 573 | } |
Denys Vlasenko | 8f0af3b | 2010-11-29 02:55:35 +0100 | [diff] [blame] | 574 | # else |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 575 | static inline void parse_config_file(void) |
| 576 | { |
Denis Vlasenko | 5e34ff2 | 2009-04-21 11:09:40 +0000 | [diff] [blame] | 577 | IF_FEATURE_SUID(ruid = getuid();) |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 578 | } |
Denys Vlasenko | 8f0af3b | 2010-11-29 02:55:35 +0100 | [diff] [blame] | 579 | # endif /* FEATURE_SUID_CONFIG */ |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 580 | |
| 581 | |
Denys Vlasenko | 9cc3d3a | 2016-12-23 02:42:26 +0100 | [diff] [blame] | 582 | # if ENABLE_FEATURE_SUID && NUM_APPLETS > 0 |
Cristian Ionescu-Idbohrn | f1d76b6 | 2017-01-02 11:17:09 +0100 | [diff] [blame] | 583 | # if ENABLE_FEATURE_SUID_CONFIG |
Denys Vlasenko | 9cc3d3a | 2016-12-23 02:42:26 +0100 | [diff] [blame] | 584 | /* check if u is member of group g */ |
| 585 | static int ingroup(uid_t u, gid_t g) |
| 586 | { |
| 587 | struct group *grp = getgrgid(g); |
| 588 | if (grp) { |
| 589 | char **mem; |
| 590 | for (mem = grp->gr_mem; *mem; mem++) { |
| 591 | struct passwd *pwd = getpwnam(*mem); |
| 592 | if (pwd && (pwd->pw_uid == u)) |
| 593 | return 1; |
| 594 | } |
| 595 | } |
| 596 | return 0; |
| 597 | } |
Cristian Ionescu-Idbohrn | f1d76b6 | 2017-01-02 11:17:09 +0100 | [diff] [blame] | 598 | # endif |
Denys Vlasenko | 9cc3d3a | 2016-12-23 02:42:26 +0100 | [diff] [blame] | 599 | |
Denis Vlasenko | 1aa7e47 | 2007-11-28 06:49:03 +0000 | [diff] [blame] | 600 | static void check_suid(int applet_no) |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 601 | { |
| 602 | gid_t rgid; /* real gid */ |
| 603 | |
| 604 | if (ruid == 0) /* set by parse_config_file() */ |
| 605 | return; /* run by root - no need to check more */ |
| 606 | rgid = getgid(); |
| 607 | |
Denys Vlasenko | 8f0af3b | 2010-11-29 02:55:35 +0100 | [diff] [blame] | 608 | # if ENABLE_FEATURE_SUID_CONFIG |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 609 | if (suid_cfg_readable) { |
| 610 | uid_t uid; |
Denys Vlasenko | 9be4702 | 2011-05-16 12:21:31 +0200 | [diff] [blame] | 611 | struct suid_config_t *sct; |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 612 | mode_t m; |
| 613 | |
| 614 | for (sct = suid_config; sct; sct = sct->m_next) { |
Denis Vlasenko | 1aa7e47 | 2007-11-28 06:49:03 +0000 | [diff] [blame] | 615 | if (sct->m_applet == applet_no) |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 616 | goto found; |
| 617 | } |
Denis Vlasenko | 15ca51e | 2007-10-29 19:25:45 +0000 | [diff] [blame] | 618 | goto check_need_suid; |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 619 | found: |
Denys Vlasenko | 3770b6b | 2011-05-16 13:19:25 +0200 | [diff] [blame] | 620 | /* Is this user allowed to run this applet? */ |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 621 | m = sct->m_mode; |
Denys Vlasenko | 4566e17 | 2011-05-16 00:01:08 +0200 | [diff] [blame] | 622 | if (sct->m_ugid.uid == ruid) |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 623 | /* same uid */ |
| 624 | m >>= 6; |
Denys Vlasenko | 4566e17 | 2011-05-16 00:01:08 +0200 | [diff] [blame] | 625 | else if ((sct->m_ugid.gid == rgid) || ingroup(ruid, sct->m_ugid.gid)) |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 626 | /* same group / in group */ |
| 627 | m >>= 3; |
Denys Vlasenko | 3770b6b | 2011-05-16 13:19:25 +0200 | [diff] [blame] | 628 | if (!(m & S_IXOTH)) /* is x bit not set? */ |
Denys Vlasenko | d83aff1 | 2011-05-16 13:53:19 +0200 | [diff] [blame] | 629 | bb_error_msg_and_die("you have no permission to run this applet"); |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 630 | |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 631 | /* We set effective AND saved ids. If saved-id is not set |
Denys Vlasenko | 3770b6b | 2011-05-16 13:19:25 +0200 | [diff] [blame] | 632 | * like we do below, seteuid(0) can still later succeed! */ |
| 633 | |
| 634 | /* Are we directed to change gid |
| 635 | * (APPLET = *s* USER.GROUP or APPLET = *S* USER.GROUP)? |
| 636 | */ |
| 637 | if (sct->m_mode & S_ISGID) |
| 638 | rgid = sct->m_ugid.gid; |
| 639 | /* else: we will set egid = rgid, thus dropping sgid effect */ |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 640 | if (setresgid(-1, rgid, rgid)) |
| 641 | bb_perror_msg_and_die("setresgid"); |
| 642 | |
Denys Vlasenko | 3770b6b | 2011-05-16 13:19:25 +0200 | [diff] [blame] | 643 | /* Are we directed to change uid |
| 644 | * (APPLET = s** USER.GROUP or APPLET = S** USER.GROUP)? |
| 645 | */ |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 646 | uid = ruid; |
| 647 | if (sct->m_mode & S_ISUID) |
Denys Vlasenko | 4566e17 | 2011-05-16 00:01:08 +0200 | [diff] [blame] | 648 | uid = sct->m_ugid.uid; |
Denys Vlasenko | 3770b6b | 2011-05-16 13:19:25 +0200 | [diff] [blame] | 649 | /* else: we will set euid = ruid, thus dropping suid effect */ |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 650 | if (setresuid(-1, uid, uid)) |
| 651 | bb_perror_msg_and_die("setresuid"); |
Denys Vlasenko | 3770b6b | 2011-05-16 13:19:25 +0200 | [diff] [blame] | 652 | |
Denys Vlasenko | 9be4702 | 2011-05-16 12:21:31 +0200 | [diff] [blame] | 653 | goto ret; |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 654 | } |
Denys Vlasenko | 8f0af3b | 2010-11-29 02:55:35 +0100 | [diff] [blame] | 655 | # if !ENABLE_FEATURE_SUID_CONFIG_QUIET |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 656 | { |
| 657 | static bool onetime = 0; |
| 658 | |
| 659 | if (!onetime) { |
| 660 | onetime = 1; |
Denys Vlasenko | 9be4702 | 2011-05-16 12:21:31 +0200 | [diff] [blame] | 661 | bb_error_msg("using fallback suid method"); |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 662 | } |
| 663 | } |
Denys Vlasenko | 8f0af3b | 2010-11-29 02:55:35 +0100 | [diff] [blame] | 664 | # endif |
Denis Vlasenko | 15ca51e | 2007-10-29 19:25:45 +0000 | [diff] [blame] | 665 | check_need_suid: |
Denys Vlasenko | 8f0af3b | 2010-11-29 02:55:35 +0100 | [diff] [blame] | 666 | # endif |
Denys Vlasenko | b9f2d9f | 2011-01-18 13:58:01 +0100 | [diff] [blame] | 667 | if (APPLET_SUID(applet_no) == BB_SUID_REQUIRE) { |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 668 | /* Real uid is not 0. If euid isn't 0 too, suid bit |
| 669 | * is most probably not set on our executable */ |
| 670 | if (geteuid()) |
Denis Vlasenko | 15ca51e | 2007-10-29 19:25:45 +0000 | [diff] [blame] | 671 | bb_error_msg_and_die("must be suid to work properly"); |
Denys Vlasenko | b9f2d9f | 2011-01-18 13:58:01 +0100 | [diff] [blame] | 672 | } else if (APPLET_SUID(applet_no) == BB_SUID_DROP) { |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 673 | xsetgid(rgid); /* drop all privileges */ |
| 674 | xsetuid(ruid); |
| 675 | } |
Denys Vlasenko | 9be4702 | 2011-05-16 12:21:31 +0200 | [diff] [blame] | 676 | # if ENABLE_FEATURE_SUID_CONFIG |
Cristian Ionescu-Idbohrn | ea137aa | 2011-05-20 03:52:36 +0200 | [diff] [blame] | 677 | ret: ; |
Denys Vlasenko | 9be4702 | 2011-05-16 12:21:31 +0200 | [diff] [blame] | 678 | llist_free((llist_t*)suid_config, NULL); |
| 679 | # endif |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 680 | } |
Denys Vlasenko | 8f0af3b | 2010-11-29 02:55:35 +0100 | [diff] [blame] | 681 | # else |
| 682 | # define check_suid(x) ((void)0) |
| 683 | # endif /* FEATURE_SUID */ |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 684 | |
| 685 | |
Denys Vlasenko | 8f0af3b | 2010-11-29 02:55:35 +0100 | [diff] [blame] | 686 | # if ENABLE_FEATURE_INSTALLER |
Denys Vlasenko | 5a7c720 | 2010-04-20 21:02:57 -0400 | [diff] [blame] | 687 | static const char usr_bin [] ALIGN1 = "/usr/bin/"; |
| 688 | static const char usr_sbin[] ALIGN1 = "/usr/sbin/"; |
| 689 | static const char *const install_dir[] = { |
| 690 | &usr_bin [8], /* "/" */ |
| 691 | &usr_bin [4], /* "/bin/" */ |
Denys Vlasenko | d4d289a | 2010-10-12 04:18:05 +0200 | [diff] [blame] | 692 | &usr_sbin[4] /* "/sbin/" */ |
Denys Vlasenko | 8f0af3b | 2010-11-29 02:55:35 +0100 | [diff] [blame] | 693 | # if !ENABLE_INSTALL_NO_USR |
Denys Vlasenko | d4d289a | 2010-10-12 04:18:05 +0200 | [diff] [blame] | 694 | ,usr_bin |
| 695 | ,usr_sbin |
Denys Vlasenko | 8f0af3b | 2010-11-29 02:55:35 +0100 | [diff] [blame] | 696 | # endif |
Denys Vlasenko | 5a7c720 | 2010-04-20 21:02:57 -0400 | [diff] [blame] | 697 | }; |
| 698 | |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 699 | /* create (sym)links for each applet */ |
Denys Vlasenko | 3b40543 | 2009-07-15 00:35:34 +0200 | [diff] [blame] | 700 | static void install_links(const char *busybox, int use_symbolic_links, |
| 701 | char *custom_install_dir) |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 702 | { |
| 703 | /* directory table |
| 704 | * this should be consistent w/ the enum, |
| 705 | * busybox.h::bb_install_loc_t, or else... */ |
Denis Vlasenko | 1aa7e47 | 2007-11-28 06:49:03 +0000 | [diff] [blame] | 706 | int (*lf)(const char *, const char *); |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 707 | char *fpc; |
Ron Yorston | 610c4c3 | 2016-03-30 00:42:05 +0200 | [diff] [blame] | 708 | const char *appname = applet_names; |
Denis Vlasenko | 6b06cb8 | 2008-05-15 21:30:45 +0000 | [diff] [blame] | 709 | unsigned i; |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 710 | int rc; |
| 711 | |
Denis Vlasenko | 1aa7e47 | 2007-11-28 06:49:03 +0000 | [diff] [blame] | 712 | lf = link; |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 713 | if (use_symbolic_links) |
| 714 | lf = symlink; |
| 715 | |
Denis Vlasenko | 745cd17 | 2007-11-29 03:31:20 +0000 | [diff] [blame] | 716 | for (i = 0; i < ARRAY_SIZE(applet_main); i++) { |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 717 | fpc = concat_path_file( |
Denys Vlasenko | 3b40543 | 2009-07-15 00:35:34 +0200 | [diff] [blame] | 718 | custom_install_dir ? custom_install_dir : install_dir[APPLET_INSTALL_LOC(i)], |
Ron Yorston | 610c4c3 | 2016-03-30 00:42:05 +0200 | [diff] [blame] | 719 | appname); |
Denis Vlasenko | 745cd17 | 2007-11-29 03:31:20 +0000 | [diff] [blame] | 720 | // debug: bb_error_msg("%slinking %s to busybox", |
| 721 | // use_symbolic_links ? "sym" : "", fpc); |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 722 | rc = lf(busybox, fpc); |
| 723 | if (rc != 0 && errno != EEXIST) { |
| 724 | bb_simple_perror_msg(fpc); |
| 725 | } |
| 726 | free(fpc); |
Ron Yorston | 610c4c3 | 2016-03-30 00:42:05 +0200 | [diff] [blame] | 727 | while (*appname++ != '\0') |
| 728 | continue; |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 729 | } |
| 730 | } |
Denys Vlasenko | 8e95068 | 2016-05-31 02:42:49 +0200 | [diff] [blame] | 731 | # elif ENABLE_BUSYBOX |
Mike Frysinger | f1999b5 | 2014-01-31 00:29:47 -0500 | [diff] [blame] | 732 | static void install_links(const char *busybox UNUSED_PARAM, |
| 733 | int use_symbolic_links UNUSED_PARAM, |
| 734 | char *custom_install_dir UNUSED_PARAM) |
| 735 | { |
| 736 | } |
Denys Vlasenko | 8f0af3b | 2010-11-29 02:55:35 +0100 | [diff] [blame] | 737 | # endif |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 738 | |
Denys Vlasenko | 8e95068 | 2016-05-31 02:42:49 +0200 | [diff] [blame] | 739 | # if ENABLE_BUSYBOX |
Ron Yorston | 1b0dcc0 | 2016-07-05 14:07:50 +0100 | [diff] [blame] | 740 | static void run_applet_and_exit(const char *name, char **argv) NORETURN; |
| 741 | |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 742 | /* If we were called as "busybox..." */ |
| 743 | static int busybox_main(char **argv) |
| 744 | { |
| 745 | if (!argv[1]) { |
| 746 | /* Called without arguments */ |
Denis Vlasenko | 1aa7e47 | 2007-11-28 06:49:03 +0000 | [diff] [blame] | 747 | const char *a; |
Denys Vlasenko | 0149f02 | 2009-05-19 18:01:42 +0200 | [diff] [blame] | 748 | int col; |
| 749 | unsigned output_width; |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 750 | help: |
| 751 | output_width = 80; |
| 752 | if (ENABLE_FEATURE_AUTOWIDTH) { |
| 753 | /* Obtain the terminal width */ |
Denys Vlasenko | 641caae | 2015-10-23 01:44:22 +0200 | [diff] [blame] | 754 | output_width = get_terminal_width(2); |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 755 | } |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 756 | |
Denis Vlasenko | 21278df | 2008-06-25 12:15:46 +0000 | [diff] [blame] | 757 | dup2(1, 2); |
Denys Vlasenko | 630dde1 | 2009-08-30 19:57:49 +0200 | [diff] [blame] | 758 | full_write2_str(bb_banner); /* reuse const string */ |
| 759 | full_write2_str(" multi-call binary.\n"); /* reuse */ |
| 760 | full_write2_str( |
Aaro Koskinen | 7b729ed | 2015-04-02 00:55:17 +0300 | [diff] [blame] | 761 | "BusyBox is copyrighted by many authors between 1998-2015.\n" |
Bradley M. Kuhn | 0e941d5 | 2012-07-13 11:38:38 -0400 | [diff] [blame] | 762 | "Licensed under GPLv2. See source distribution for detailed\n" |
| 763 | "copyright notices.\n" |
Denys Vlasenko | 5a7c720 | 2010-04-20 21:02:57 -0400 | [diff] [blame] | 764 | "\n" |
Denys Vlasenko | 02b8b9b | 2012-05-14 23:52:57 +0200 | [diff] [blame] | 765 | "Usage: busybox [function [arguments]...]\n" |
Denys Vlasenko | ba88826 | 2012-03-22 11:15:06 +0100 | [diff] [blame] | 766 | " or: busybox --list"IF_FEATURE_INSTALLER("[-full]")"\n" |
| 767 | IF_FEATURE_INSTALLER( |
| 768 | " or: busybox --install [-s] [DIR]\n" |
| 769 | ) |
Denys Vlasenko | 5a7c720 | 2010-04-20 21:02:57 -0400 | [diff] [blame] | 770 | " or: function [arguments]...\n" |
| 771 | "\n" |
Ron Yorston | ae57af6 | 2015-05-30 17:13:52 +0100 | [diff] [blame] | 772 | IF_NOT_FEATURE_SH_STANDALONE( |
Denys Vlasenko | 5a7c720 | 2010-04-20 21:02:57 -0400 | [diff] [blame] | 773 | "\tBusyBox is a multi-call binary that combines many common Unix\n" |
| 774 | "\tutilities into a single executable. Most people will create a\n" |
| 775 | "\tlink to busybox for each function they wish to use and BusyBox\n" |
| 776 | "\twill act like whatever it was invoked as.\n" |
Ron Yorston | ae57af6 | 2015-05-30 17:13:52 +0100 | [diff] [blame] | 777 | ) |
| 778 | IF_FEATURE_SH_STANDALONE( |
| 779 | "\tBusyBox is a multi-call binary that combines many common Unix\n" |
| 780 | "\tutilities into a single executable. The shell in this build\n" |
| 781 | "\tis configured to run built-in utilities without $PATH search.\n" |
| 782 | "\tYou don't need to install a link to busybox for each utility.\n" |
| 783 | "\tTo run external program, use full path (/sbin/ip instead of ip).\n" |
| 784 | ) |
Denys Vlasenko | 5a7c720 | 2010-04-20 21:02:57 -0400 | [diff] [blame] | 785 | "\n" |
| 786 | "Currently defined functions:\n" |
| 787 | ); |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 788 | col = 0; |
Denis Vlasenko | 1aa7e47 | 2007-11-28 06:49:03 +0000 | [diff] [blame] | 789 | a = applet_names; |
Denys Vlasenko | 0149f02 | 2009-05-19 18:01:42 +0200 | [diff] [blame] | 790 | /* prevent last comma to be in the very last pos */ |
| 791 | output_width--; |
Denis Vlasenko | 1aa7e47 | 2007-11-28 06:49:03 +0000 | [diff] [blame] | 792 | while (*a) { |
Denys Vlasenko | 0149f02 | 2009-05-19 18:01:42 +0200 | [diff] [blame] | 793 | int len2 = strlen(a) + 2; |
| 794 | if (col >= (int)output_width - len2) { |
Denis Vlasenko | 79cedcb | 2008-04-08 21:13:28 +0000 | [diff] [blame] | 795 | full_write2_str(",\n"); |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 796 | col = 0; |
| 797 | } |
Denys Vlasenko | 0149f02 | 2009-05-19 18:01:42 +0200 | [diff] [blame] | 798 | if (col == 0) { |
| 799 | col = 6; |
| 800 | full_write2_str("\t"); |
| 801 | } else { |
| 802 | full_write2_str(", "); |
| 803 | } |
Denis Vlasenko | 79cedcb | 2008-04-08 21:13:28 +0000 | [diff] [blame] | 804 | full_write2_str(a); |
Denys Vlasenko | 0149f02 | 2009-05-19 18:01:42 +0200 | [diff] [blame] | 805 | col += len2; |
| 806 | a += len2 - 1; |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 807 | } |
Denys Vlasenko | 7d877fc | 2016-11-28 01:29:28 +0100 | [diff] [blame] | 808 | full_write2_str("\n"); |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 809 | return 0; |
| 810 | } |
| 811 | |
Denys Vlasenko | 8dff01d | 2015-03-12 17:48:34 +0100 | [diff] [blame] | 812 | if (is_prefixed_with(argv[1], "--list")) { |
Denys Vlasenko | 5a7c720 | 2010-04-20 21:02:57 -0400 | [diff] [blame] | 813 | unsigned i = 0; |
| 814 | const char *a = applet_names; |
| 815 | dup2(1, 2); |
| 816 | while (*a) { |
Denys Vlasenko | 8e95068 | 2016-05-31 02:42:49 +0200 | [diff] [blame] | 817 | # if ENABLE_FEATURE_INSTALLER |
Denys Vlasenko | ba88826 | 2012-03-22 11:15:06 +0100 | [diff] [blame] | 818 | if (argv[1][6]) /* --list-full? */ |
Denys Vlasenko | 5a7c720 | 2010-04-20 21:02:57 -0400 | [diff] [blame] | 819 | full_write2_str(install_dir[APPLET_INSTALL_LOC(i)] + 1); |
Denys Vlasenko | 8e95068 | 2016-05-31 02:42:49 +0200 | [diff] [blame] | 820 | # endif |
Denys Vlasenko | 5a7c720 | 2010-04-20 21:02:57 -0400 | [diff] [blame] | 821 | full_write2_str(a); |
| 822 | full_write2_str("\n"); |
| 823 | i++; |
Ron Yorston | 2b91958 | 2016-04-08 11:57:20 +0100 | [diff] [blame] | 824 | while (*a++ != '\0') |
| 825 | continue; |
Denys Vlasenko | 5a7c720 | 2010-04-20 21:02:57 -0400 | [diff] [blame] | 826 | } |
| 827 | return 0; |
| 828 | } |
| 829 | |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 830 | if (ENABLE_FEATURE_INSTALLER && strcmp(argv[1], "--install") == 0) { |
Denys Vlasenko | 3b40543 | 2009-07-15 00:35:34 +0200 | [diff] [blame] | 831 | int use_symbolic_links; |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 832 | const char *busybox; |
Denys Vlasenko | 4a2a86d | 2011-03-06 06:02:31 +0100 | [diff] [blame] | 833 | |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 834 | busybox = xmalloc_readlink(bb_busybox_exec_path); |
Denys Vlasenko | 4a2a86d | 2011-03-06 06:02:31 +0100 | [diff] [blame] | 835 | if (!busybox) { |
| 836 | /* bb_busybox_exec_path is usually "/proc/self/exe". |
| 837 | * In chroot, readlink("/proc/self/exe") usually fails. |
| 838 | * In such case, better use argv[0] as symlink target |
| 839 | * if it is a full path name. |
| 840 | */ |
Denys Vlasenko | 5c94271 | 2011-03-12 06:08:28 +0100 | [diff] [blame] | 841 | if (argv[0][0] != '/') |
| 842 | bb_error_msg_and_die("'%s' is not an absolute path", argv[0]); |
| 843 | busybox = argv[0]; |
Denys Vlasenko | 4a2a86d | 2011-03-06 06:02:31 +0100 | [diff] [blame] | 844 | } |
| 845 | /* busybox --install [-s] [DIR]: |
| 846 | * -s: make symlinks |
| 847 | * DIR: directory to install links to |
| 848 | */ |
Denys Vlasenko | ba88826 | 2012-03-22 11:15:06 +0100 | [diff] [blame] | 849 | use_symbolic_links = (argv[2] && strcmp(argv[2], "-s") == 0 && ++argv); |
Denys Vlasenko | 3b40543 | 2009-07-15 00:35:34 +0200 | [diff] [blame] | 850 | install_links(busybox, use_symbolic_links, argv[2]); |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 851 | return 0; |
| 852 | } |
| 853 | |
| 854 | if (strcmp(argv[1], "--help") == 0) { |
| 855 | /* "busybox --help [<applet>]" */ |
| 856 | if (!argv[2]) |
| 857 | goto help; |
| 858 | /* convert to "<applet> --help" */ |
| 859 | argv[0] = argv[2]; |
| 860 | argv[2] = NULL; |
| 861 | } else { |
| 862 | /* "busybox <applet> arg1 arg2 ..." */ |
| 863 | argv++; |
| 864 | } |
| 865 | /* We support "busybox /a/path/to/applet args..." too. Allows for |
| 866 | * "#!/bin/busybox"-style wrappers */ |
| 867 | applet_name = bb_get_last_path_component_nostrip(argv[0]); |
| 868 | run_applet_and_exit(applet_name, argv); |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 869 | } |
Denys Vlasenko | 8e95068 | 2016-05-31 02:42:49 +0200 | [diff] [blame] | 870 | # endif |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 871 | |
Denys Vlasenko | f4f8fe8 | 2016-07-05 21:43:28 +0200 | [diff] [blame] | 872 | # if NUM_APPLETS > 0 |
Denis Vlasenko | defc1ea | 2008-06-27 02:52:20 +0000 | [diff] [blame] | 873 | void FAST_FUNC run_applet_no_and_exit(int applet_no, char **argv) |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 874 | { |
| 875 | int argc = 1; |
| 876 | |
| 877 | while (argv[argc]) |
| 878 | argc++; |
| 879 | |
| 880 | /* Reinit some shared global data */ |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 881 | xfunc_error_retval = EXIT_FAILURE; |
Ron Yorston | 610c4c3 | 2016-03-30 00:42:05 +0200 | [diff] [blame] | 882 | applet_name = bb_get_last_path_component_nostrip(argv[0]); |
Denys Vlasenko | cd7a38a | 2014-09-18 00:47:05 +0200 | [diff] [blame] | 883 | |
Denys Vlasenko | cd7a38a | 2014-09-18 00:47:05 +0200 | [diff] [blame] | 884 | /* Special case. POSIX says "test --help" |
| 885 | * should be no different from e.g. "test --foo". |
| 886 | * Thus for "test", we skip --help check. |
Denys Vlasenko | de5edad | 2015-04-21 16:00:41 +0200 | [diff] [blame] | 887 | * "true" and "false" are also special. |
Denys Vlasenko | cd7a38a | 2014-09-18 00:47:05 +0200 | [diff] [blame] | 888 | */ |
Denys Vlasenko | de5edad | 2015-04-21 16:00:41 +0200 | [diff] [blame] | 889 | if (1 |
Denys Vlasenko | f4f8fe8 | 2016-07-05 21:43:28 +0200 | [diff] [blame] | 890 | # if defined APPLET_NO_test |
Denys Vlasenko | de5edad | 2015-04-21 16:00:41 +0200 | [diff] [blame] | 891 | && applet_no != APPLET_NO_test |
Denys Vlasenko | f4f8fe8 | 2016-07-05 21:43:28 +0200 | [diff] [blame] | 892 | # endif |
| 893 | # if defined APPLET_NO_true |
Denys Vlasenko | de5edad | 2015-04-21 16:00:41 +0200 | [diff] [blame] | 894 | && applet_no != APPLET_NO_true |
Denys Vlasenko | f4f8fe8 | 2016-07-05 21:43:28 +0200 | [diff] [blame] | 895 | # endif |
| 896 | # if defined APPLET_NO_false |
Denys Vlasenko | de5edad | 2015-04-21 16:00:41 +0200 | [diff] [blame] | 897 | && applet_no != APPLET_NO_false |
Denys Vlasenko | f4f8fe8 | 2016-07-05 21:43:28 +0200 | [diff] [blame] | 898 | # endif |
Denys Vlasenko | de5edad | 2015-04-21 16:00:41 +0200 | [diff] [blame] | 899 | ) { |
| 900 | if (argc == 2 && strcmp(argv[1], "--help") == 0) { |
| 901 | /* Make "foo --help" exit with 0: */ |
| 902 | xfunc_error_retval = 0; |
Denis Vlasenko | bd28f6b | 2008-07-19 08:15:13 +0000 | [diff] [blame] | 903 | bb_show_usage(); |
Denys Vlasenko | 5d78355 | 2013-01-17 11:02:21 +0100 | [diff] [blame] | 904 | } |
Denis Vlasenko | bd28f6b | 2008-07-19 08:15:13 +0000 | [diff] [blame] | 905 | } |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 906 | if (ENABLE_FEATURE_SUID) |
Denis Vlasenko | 1aa7e47 | 2007-11-28 06:49:03 +0000 | [diff] [blame] | 907 | check_suid(applet_no); |
Denys Vlasenko | 215b0ca | 2016-08-19 18:23:56 +0200 | [diff] [blame] | 908 | xfunc_error_retval = applet_main[applet_no](argc, argv); |
| 909 | /* Note: applet_main() may also not return (die on a xfunc or such) */ |
| 910 | xfunc_die(); |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 911 | } |
Denys Vlasenko | f4f8fe8 | 2016-07-05 21:43:28 +0200 | [diff] [blame] | 912 | # endif /* NUM_APPLETS > 0 */ |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 913 | |
Denys Vlasenko | 7e8218f | 2016-11-18 21:42:44 +0100 | [diff] [blame] | 914 | # if ENABLE_BUSYBOX || NUM_APPLETS > 0 |
Ron Yorston | ce824ae | 2016-06-07 12:12:07 +0100 | [diff] [blame] | 915 | static NORETURN void run_applet_and_exit(const char *name, char **argv) |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 916 | { |
Denys Vlasenko | 7e8218f | 2016-11-18 21:42:44 +0100 | [diff] [blame] | 917 | # if ENABLE_BUSYBOX |
Denys Vlasenko | 8dff01d | 2015-03-12 17:48:34 +0100 | [diff] [blame] | 918 | if (is_prefixed_with(name, "busybox")) |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 919 | exit(busybox_main(argv)); |
Denys Vlasenko | 7e8218f | 2016-11-18 21:42:44 +0100 | [diff] [blame] | 920 | # endif |
| 921 | # if NUM_APPLETS > 0 |
Ron Yorston | 610c4c3 | 2016-03-30 00:42:05 +0200 | [diff] [blame] | 922 | /* find_applet_by_name() search is more expensive, so goes second */ |
Denys Vlasenko | f4f8fe8 | 2016-07-05 21:43:28 +0200 | [diff] [blame] | 923 | { |
| 924 | int applet = find_applet_by_name(name); |
| 925 | if (applet >= 0) |
| 926 | run_applet_no_and_exit(applet, argv); |
| 927 | } |
Denys Vlasenko | 7e8218f | 2016-11-18 21:42:44 +0100 | [diff] [blame] | 928 | # endif |
Ron Yorston | ce824ae | 2016-06-07 12:12:07 +0100 | [diff] [blame] | 929 | |
| 930 | /*bb_error_msg_and_die("applet not found"); - links in printf */ |
| 931 | full_write2_str(applet_name); |
| 932 | full_write2_str(": applet not found\n"); |
| 933 | /* POSIX: "If a command is not found, the exit status shall be 127" */ |
| 934 | exit(127); |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 935 | } |
Denys Vlasenko | 7e8218f | 2016-11-18 21:42:44 +0100 | [diff] [blame] | 936 | # endif |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 937 | |
Denis Vlasenko | 10f6fb1 | 2008-04-29 00:10:27 +0000 | [diff] [blame] | 938 | #endif /* !defined(SINGLE_APPLET_MAIN) */ |
Denis Vlasenko | 468aea2 | 2008-04-01 14:47:57 +0000 | [diff] [blame] | 939 | |
| 940 | |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 941 | #if ENABLE_BUILD_LIBBUSYBOX |
Denis Vlasenko | 85c2471 | 2008-03-17 09:04:04 +0000 | [diff] [blame] | 942 | int lbb_main(char **argv) |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 943 | #else |
Denis Vlasenko | a60f84e | 2008-07-05 09:18:54 +0000 | [diff] [blame] | 944 | int main(int argc UNUSED_PARAM, char **argv) |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 945 | #endif |
| 946 | { |
Denys Vlasenko | bc14f4d | 2016-04-03 16:06:42 +0200 | [diff] [blame] | 947 | #if 0 |
| 948 | /* TODO: find a use for a block of memory between end of .bss |
| 949 | * and end of page. For example, I'm getting "_end:0x812e698 2408 bytes" |
| 950 | * - more than 2k of wasted memory (in this particular build) |
| 951 | * *per each running process*! |
| 952 | * (If your linker does not generate "_end" name, weak attribute |
| 953 | * makes &_end == NULL, end_len == 0 here.) |
| 954 | */ |
| 955 | extern char _end[] __attribute__((weak)); |
| 956 | unsigned end_len = (-(int)_end) & 0xfff; |
| 957 | printf("_end:%p %u bytes\n", &_end, end_len); |
| 958 | #endif |
| 959 | |
Denys Vlasenko | 1f7c167 | 2009-09-06 02:12:28 +0200 | [diff] [blame] | 960 | /* Tweak malloc for reduced memory consumption */ |
Denys Vlasenko | 1f7c167 | 2009-09-06 02:12:28 +0200 | [diff] [blame] | 961 | #ifdef M_TRIM_THRESHOLD |
| 962 | /* M_TRIM_THRESHOLD is the maximum amount of freed top-most memory |
| 963 | * to keep before releasing to the OS |
| 964 | * Default is way too big: 256k |
| 965 | */ |
Denys Vlasenko | fe86d6b | 2011-06-03 21:39:42 +0200 | [diff] [blame] | 966 | mallopt(M_TRIM_THRESHOLD, 8 * 1024); |
Denys Vlasenko | 1f7c167 | 2009-09-06 02:12:28 +0200 | [diff] [blame] | 967 | #endif |
| 968 | #ifdef M_MMAP_THRESHOLD |
| 969 | /* M_MMAP_THRESHOLD is the request size threshold for using mmap() |
| 970 | * Default is too big: 256k |
| 971 | */ |
Denys Vlasenko | fe86d6b | 2011-06-03 21:39:42 +0200 | [diff] [blame] | 972 | mallopt(M_MMAP_THRESHOLD, 32 * 1024 - 256); |
Denys Vlasenko | 1f7c167 | 2009-09-06 02:12:28 +0200 | [diff] [blame] | 973 | #endif |
Denys Vlasenko | 7f0ebbc | 2016-10-03 17:42:53 +0200 | [diff] [blame] | 974 | #if 0 /*def M_TOP_PAD*/ |
| 975 | /* When the program break is increased, then M_TOP_PAD bytes are added |
| 976 | * to the sbrk(2) request. When the heap is trimmed because of free(3), |
| 977 | * this much free space is preserved at the top of the heap. |
| 978 | * glibc default seems to be way too big: 128k, but need to verify. |
| 979 | */ |
| 980 | mallopt(M_TOP_PAD, 8 * 1024); |
| 981 | #endif |
Denys Vlasenko | 1f7c167 | 2009-09-06 02:12:28 +0200 | [diff] [blame] | 982 | |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 983 | #if !BB_MMU |
| 984 | /* NOMMU re-exec trick sets high-order bit in first byte of name */ |
| 985 | if (argv[0][0] & 0x80) { |
| 986 | re_execed = 1; |
| 987 | argv[0][0] &= 0x7f; |
| 988 | } |
| 989 | #endif |
Denys Vlasenko | 8f0af3b | 2010-11-29 02:55:35 +0100 | [diff] [blame] | 990 | |
| 991 | #if defined(SINGLE_APPLET_MAIN) |
Denys Vlasenko | 7e8218f | 2016-11-18 21:42:44 +0100 | [diff] [blame] | 992 | |
Denys Vlasenko | 8f0af3b | 2010-11-29 02:55:35 +0100 | [diff] [blame] | 993 | /* Only one applet is selected in .config */ |
Denys Vlasenko | 8dff01d | 2015-03-12 17:48:34 +0100 | [diff] [blame] | 994 | if (argv[1] && is_prefixed_with(argv[0], "busybox")) { |
Denys Vlasenko | 8f0af3b | 2010-11-29 02:55:35 +0100 | [diff] [blame] | 995 | /* "busybox <applet> <params>" should still work as expected */ |
| 996 | argv++; |
| 997 | } |
| 998 | /* applet_names in this case is just "applet\0\0" */ |
| 999 | lbb_prepare(applet_names IF_FEATURE_INDIVIDUAL(, argv)); |
| 1000 | return SINGLE_APPLET_MAIN(argc, argv); |
Denys Vlasenko | 8f0af3b | 2010-11-29 02:55:35 +0100 | [diff] [blame] | 1001 | |
Denys Vlasenko | 7e8218f | 2016-11-18 21:42:44 +0100 | [diff] [blame] | 1002 | #elif !ENABLE_BUSYBOX && NUM_APPLETS == 0 |
| 1003 | |
| 1004 | full_write2_str(bb_basename(argv[0])); |
| 1005 | full_write2_str(": no applets enabled\n"); |
| 1006 | exit(127); |
| 1007 | |
| 1008 | #else |
| 1009 | |
| 1010 | lbb_prepare("busybox" IF_FEATURE_INDIVIDUAL(, argv)); |
Denys Vlasenko | f4f8fe8 | 2016-07-05 21:43:28 +0200 | [diff] [blame] | 1011 | # if !ENABLE_BUSYBOX |
Ron Yorston | ba12081 | 2016-06-07 10:26:24 +0100 | [diff] [blame] | 1012 | if (argv[1] && is_prefixed_with(bb_basename(argv[0]), "busybox")) |
| 1013 | argv++; |
Denys Vlasenko | f4f8fe8 | 2016-07-05 21:43:28 +0200 | [diff] [blame] | 1014 | # endif |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 1015 | applet_name = argv[0]; |
| 1016 | if (applet_name[0] == '-') |
| 1017 | applet_name++; |
| 1018 | applet_name = bb_basename(applet_name); |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 1019 | parse_config_file(); /* ...maybe, if FEATURE_SUID_CONFIG */ |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 1020 | run_applet_and_exit(applet_name, argv); |
Denys Vlasenko | 7e8218f | 2016-11-18 21:42:44 +0100 | [diff] [blame] | 1021 | |
Denis Vlasenko | 468aea2 | 2008-04-01 14:47:57 +0000 | [diff] [blame] | 1022 | #endif |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 1023 | } |