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 | */ |
Denis Vlasenko | 79cedcb | 2008-04-08 21:13:28 +0000 | [diff] [blame] | 14 | /* We are trying to not use printf, this benefits the case when selected |
| 15 | * applets are really simple. Example: |
| 16 | * |
| 17 | * $ ./busybox |
| 18 | * ... |
| 19 | * Currently defined functions: |
| 20 | * basename, false, true |
| 21 | * |
| 22 | * $ size busybox |
| 23 | * text data bss dec hex filename |
| 24 | * 4473 52 72 4597 11f5 busybox |
| 25 | * |
| 26 | * FEATURE_INSTALLER or FEATURE_SUID will still link printf routines in. :( |
| 27 | */ |
Denys Vlasenko | c1947f1 | 2009-10-23 01:30:26 +0200 | [diff] [blame] | 28 | #include "busybox.h" |
Denys Vlasenko | 9be4702 | 2011-05-16 12:21:31 +0200 | [diff] [blame] | 29 | |
Denys Vlasenko | 8da415e | 2010-12-05 01:30:14 +0100 | [diff] [blame] | 30 | #if !(defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__NetBSD__) \ |
Denys Vlasenko | 982e87f | 2013-07-30 11:52:58 +0200 | [diff] [blame] | 31 | || defined(__APPLE__) \ |
Denys Vlasenko | 8da415e | 2010-12-05 01:30:14 +0100 | [diff] [blame] | 32 | ) |
| 33 | # include <malloc.h> /* for mallopt */ |
| 34 | #endif |
Denys Vlasenko | 9be4702 | 2011-05-16 12:21:31 +0200 | [diff] [blame] | 35 | |
Denis Vlasenko | ac7d0e3 | 2007-10-08 19:32:12 +0000 | [diff] [blame] | 36 | /* Declare <applet>_main() */ |
| 37 | #define PROTOTYPES |
| 38 | #include "applets.h" |
| 39 | #undef PROTOTYPES |
| 40 | |
Denis Vlasenko | 32b2a9f | 2008-02-22 22:43:22 +0000 | [diff] [blame] | 41 | /* Include generated applet names, pointers to <applet>_main, etc */ |
Denis Vlasenko | 1aa7e47 | 2007-11-28 06:49:03 +0000 | [diff] [blame] | 42 | #include "applet_tables.h" |
Denis Vlasenko | 468aea2 | 2008-04-01 14:47:57 +0000 | [diff] [blame] | 43 | /* ...and if applet_tables generator says we have only one applet... */ |
| 44 | #ifdef SINGLE_APPLET_MAIN |
Denys Vlasenko | 0e5ba08 | 2010-06-05 23:11:07 +0200 | [diff] [blame] | 45 | # undef ENABLE_FEATURE_INDIVIDUAL |
| 46 | # define ENABLE_FEATURE_INDIVIDUAL 1 |
| 47 | # undef IF_FEATURE_INDIVIDUAL |
| 48 | # define IF_FEATURE_INDIVIDUAL(...) __VA_ARGS__ |
Denis Vlasenko | 468aea2 | 2008-04-01 14:47:57 +0000 | [diff] [blame] | 49 | #endif |
Denis Vlasenko | ac7d0e3 | 2007-10-08 19:32:12 +0000 | [diff] [blame] | 50 | |
Denys Vlasenko | 0e5ba08 | 2010-06-05 23:11:07 +0200 | [diff] [blame] | 51 | #include "usage_compressed.h" |
| 52 | |
Denys Vlasenko | fe93624 | 2017-01-06 19:16:36 +0100 | [diff] [blame] | 53 | |
| 54 | /* "Do not compress usage text if uncompressed text is small |
| 55 | * and we don't include bunzip2 code for other reasons" |
| 56 | * |
| 57 | * Useful for mass one-applet rebuild (bunzip2 code is ~2.7k). |
| 58 | * |
| 59 | * Unlike BUNZIP2, if FEATURE_SEAMLESS_BZ2 is on, bunzip2 code is built but |
| 60 | * still may be unused if none of the selected applets calls open_zipped() |
| 61 | * or its friends; we test for (FEATURE_SEAMLESS_BZ2 && <APPLET>) instead. |
| 62 | * For example, only if TAR and FEATURE_SEAMLESS_BZ2 are both selected, |
| 63 | * then bunzip2 code will be linked in anyway, and disabling help compression |
| 64 | * would be not optimal: |
| 65 | */ |
| 66 | #if UNPACKED_USAGE_LENGTH < 4*1024 \ |
| 67 | && !(ENABLE_FEATURE_SEAMLESS_BZ2 && ENABLE_TAR) \ |
| 68 | && !(ENABLE_FEATURE_SEAMLESS_BZ2 && ENABLE_MODPROBE) \ |
| 69 | && !(ENABLE_FEATURE_SEAMLESS_BZ2 && ENABLE_INSMOD) \ |
| 70 | && !(ENABLE_FEATURE_SEAMLESS_BZ2 && ENABLE_DEPMOD) \ |
| 71 | && !(ENABLE_FEATURE_SEAMLESS_BZ2 && ENABLE_MAN) \ |
| 72 | && !ENABLE_BUNZIP2 \ |
| 73 | && !ENABLE_BZCAT |
| 74 | # undef ENABLE_FEATURE_COMPRESS_USAGE |
| 75 | # define ENABLE_FEATURE_COMPRESS_USAGE 0 |
| 76 | #endif |
| 77 | |
| 78 | |
Denys Vlasenko | d4e4fdb | 2017-07-03 21:31:16 +0200 | [diff] [blame] | 79 | unsigned FAST_FUNC string_array_len(char **argv) |
| 80 | { |
| 81 | char **start = argv; |
| 82 | |
| 83 | while (*argv) |
| 84 | argv++; |
| 85 | |
| 86 | return argv - start; |
| 87 | } |
| 88 | |
| 89 | |
Denys Vlasenko | 0e5ba08 | 2010-06-05 23:11:07 +0200 | [diff] [blame] | 90 | #if ENABLE_SHOW_USAGE && !ENABLE_FEATURE_COMPRESS_USAGE |
| 91 | static const char usage_messages[] ALIGN1 = UNPACKED_USAGE; |
| 92 | #else |
| 93 | # define usage_messages 0 |
Denys Vlasenko | 1fcbff2 | 2010-06-26 02:40:08 +0200 | [diff] [blame] | 94 | #endif |
Denys Vlasenko | 0e5ba08 | 2010-06-05 23:11:07 +0200 | [diff] [blame] | 95 | |
Denis Vlasenko | ac7d0e3 | 2007-10-08 19:32:12 +0000 | [diff] [blame] | 96 | #if ENABLE_FEATURE_COMPRESS_USAGE |
| 97 | |
Denys Vlasenko | 5c296de | 2010-07-03 14:28:35 +0200 | [diff] [blame] | 98 | static const char packed_usage[] ALIGN1 = { PACKED_USAGE }; |
Denys Vlasenko | d184a72 | 2011-09-22 12:45:14 +0200 | [diff] [blame] | 99 | # include "bb_archive.h" |
Denis Vlasenko | ac7d0e3 | 2007-10-08 19:32:12 +0000 | [diff] [blame] | 100 | static const char *unpack_usage_messages(void) |
| 101 | { |
| 102 | char *outbuf = NULL; |
| 103 | bunzip_data *bd; |
| 104 | int i; |
Denys Vlasenko | 38ccd6a | 2018-04-08 20:02:01 +0200 | [diff] [blame] | 105 | jmp_buf jmpbuf; |
Denis Vlasenko | ac7d0e3 | 2007-10-08 19:32:12 +0000 | [diff] [blame] | 106 | |
Denys Vlasenko | 38ccd6a | 2018-04-08 20:02:01 +0200 | [diff] [blame] | 107 | /* Setup for I/O error handling via longjmp */ |
| 108 | i = setjmp(jmpbuf); |
| 109 | if (i == 0) { |
| 110 | i = start_bunzip(&jmpbuf, |
| 111 | &bd, |
Denis Vlasenko | ac7d0e3 | 2007-10-08 19:32:12 +0000 | [diff] [blame] | 112 | /* src_fd: */ -1, |
Denys Vlasenko | caddfc8 | 2010-10-28 23:08:53 +0200 | [diff] [blame] | 113 | /* inbuf: */ packed_usage, |
Denys Vlasenko | 38ccd6a | 2018-04-08 20:02:01 +0200 | [diff] [blame] | 114 | /* len: */ sizeof(packed_usage) |
| 115 | ); |
| 116 | } |
| 117 | /* read_bunzip can longjmp and end up here with i != 0 |
| 118 | * on read data errors! Not trivial */ |
| 119 | if (i == 0) { |
Denis Vlasenko | ac7d0e3 | 2007-10-08 19:32:12 +0000 | [diff] [blame] | 120 | /* Cannot use xmalloc: will leak bd in NOFORK case! */ |
Denys Vlasenko | 0e5ba08 | 2010-06-05 23:11:07 +0200 | [diff] [blame] | 121 | outbuf = malloc_or_warn(sizeof(UNPACKED_USAGE)); |
Denis Vlasenko | ac7d0e3 | 2007-10-08 19:32:12 +0000 | [diff] [blame] | 122 | if (outbuf) |
Denys Vlasenko | 0e5ba08 | 2010-06-05 23:11:07 +0200 | [diff] [blame] | 123 | read_bunzip(bd, outbuf, sizeof(UNPACKED_USAGE)); |
Denis Vlasenko | ac7d0e3 | 2007-10-08 19:32:12 +0000 | [diff] [blame] | 124 | } |
| 125 | dealloc_bunzip(bd); |
| 126 | return outbuf; |
| 127 | } |
Denys Vlasenko | 0e5ba08 | 2010-06-05 23:11:07 +0200 | [diff] [blame] | 128 | # define dealloc_usage_messages(s) free(s) |
Denis Vlasenko | ac7d0e3 | 2007-10-08 19:32:12 +0000 | [diff] [blame] | 129 | |
| 130 | #else |
| 131 | |
Denys Vlasenko | 0e5ba08 | 2010-06-05 23:11:07 +0200 | [diff] [blame] | 132 | # define unpack_usage_messages() usage_messages |
| 133 | # define dealloc_usage_messages(s) ((void)(s)) |
Denis Vlasenko | ac7d0e3 | 2007-10-08 19:32:12 +0000 | [diff] [blame] | 134 | |
| 135 | #endif /* FEATURE_COMPRESS_USAGE */ |
| 136 | |
| 137 | |
Denis Vlasenko | defc1ea | 2008-06-27 02:52:20 +0000 | [diff] [blame] | 138 | void FAST_FUNC bb_show_usage(void) |
Denis Vlasenko | ac7d0e3 | 2007-10-08 19:32:12 +0000 | [diff] [blame] | 139 | { |
| 140 | if (ENABLE_SHOW_USAGE) { |
Denis Vlasenko | 468aea2 | 2008-04-01 14:47:57 +0000 | [diff] [blame] | 141 | #ifdef SINGLE_APPLET_STR |
| 142 | /* Imagine that this applet is "true". Dont suck in printf! */ |
Lauri Kasanen | 2b662c5 | 2010-11-13 23:16:05 +0100 | [diff] [blame] | 143 | const char *usage_string = unpack_usage_messages(); |
Denis Vlasenko | 468aea2 | 2008-04-01 14:47:57 +0000 | [diff] [blame] | 144 | |
Lauri Kasanen | 2b662c5 | 2010-11-13 23:16:05 +0100 | [diff] [blame] | 145 | if (*usage_string == '\b') { |
Denis Vlasenko | 4240408 | 2008-11-24 13:42:24 +0000 | [diff] [blame] | 146 | full_write2_str("No help available.\n\n"); |
Denis Vlasenko | 468aea2 | 2008-04-01 14:47:57 +0000 | [diff] [blame] | 147 | } else { |
Denis Vlasenko | 4240408 | 2008-11-24 13:42:24 +0000 | [diff] [blame] | 148 | full_write2_str("Usage: "SINGLE_APPLET_STR" "); |
Lauri Kasanen | 2b662c5 | 2010-11-13 23:16:05 +0100 | [diff] [blame] | 149 | full_write2_str(usage_string); |
Denis Vlasenko | 79cedcb | 2008-04-08 21:13:28 +0000 | [diff] [blame] | 150 | full_write2_str("\n\n"); |
Denis Vlasenko | 468aea2 | 2008-04-01 14:47:57 +0000 | [diff] [blame] | 151 | } |
Denys Vlasenko | 630dde1 | 2009-08-30 19:57:49 +0200 | [diff] [blame] | 152 | if (ENABLE_FEATURE_CLEAN_UP) |
| 153 | dealloc_usage_messages((char*)usage_string); |
Denis Vlasenko | 468aea2 | 2008-04-01 14:47:57 +0000 | [diff] [blame] | 154 | #else |
Denis Vlasenko | ac7d0e3 | 2007-10-08 19:32:12 +0000 | [diff] [blame] | 155 | const char *p; |
| 156 | const char *usage_string = p = unpack_usage_messages(); |
Denis Vlasenko | 1aa7e47 | 2007-11-28 06:49:03 +0000 | [diff] [blame] | 157 | int ap = find_applet_by_name(applet_name); |
Denis Vlasenko | ac7d0e3 | 2007-10-08 19:32:12 +0000 | [diff] [blame] | 158 | |
Denis Vlasenko | 1aa7e47 | 2007-11-28 06:49:03 +0000 | [diff] [blame] | 159 | if (ap < 0) /* never happens, paranoia */ |
Denis Vlasenko | ac7d0e3 | 2007-10-08 19:32:12 +0000 | [diff] [blame] | 160 | xfunc_die(); |
Denis Vlasenko | 1aa7e47 | 2007-11-28 06:49:03 +0000 | [diff] [blame] | 161 | while (ap) { |
Denis Vlasenko | ac7d0e3 | 2007-10-08 19:32:12 +0000 | [diff] [blame] | 162 | while (*p++) continue; |
Denis Vlasenko | 1aa7e47 | 2007-11-28 06:49:03 +0000 | [diff] [blame] | 163 | ap--; |
Denis Vlasenko | ac7d0e3 | 2007-10-08 19:32:12 +0000 | [diff] [blame] | 164 | } |
Denis Vlasenko | 79cedcb | 2008-04-08 21:13:28 +0000 | [diff] [blame] | 165 | full_write2_str(bb_banner); |
Denys Vlasenko | 630dde1 | 2009-08-30 19:57:49 +0200 | [diff] [blame] | 166 | full_write2_str(" multi-call binary.\n"); |
Denis Vlasenko | ac7d0e3 | 2007-10-08 19:32:12 +0000 | [diff] [blame] | 167 | if (*p == '\b') |
Denis Vlasenko | 79cedcb | 2008-04-08 21:13:28 +0000 | [diff] [blame] | 168 | full_write2_str("\nNo help available.\n\n"); |
| 169 | else { |
| 170 | full_write2_str("\nUsage: "); |
| 171 | full_write2_str(applet_name); |
Denys Vlasenko | 253f555 | 2018-07-09 18:23:33 +0200 | [diff] [blame] | 172 | if (p[0]) { |
| 173 | if (p[0] != '\n') |
| 174 | full_write2_str(" "); |
| 175 | full_write2_str(p); |
| 176 | } |
Denys Vlasenko | 7f4a49a | 2015-05-25 14:30:52 +0200 | [diff] [blame] | 177 | full_write2_str("\n"); |
Denis Vlasenko | 79cedcb | 2008-04-08 21:13:28 +0000 | [diff] [blame] | 178 | } |
Denys Vlasenko | 630dde1 | 2009-08-30 19:57:49 +0200 | [diff] [blame] | 179 | if (ENABLE_FEATURE_CLEAN_UP) |
| 180 | dealloc_usage_messages((char*)usage_string); |
Denis Vlasenko | 468aea2 | 2008-04-01 14:47:57 +0000 | [diff] [blame] | 181 | #endif |
Denis Vlasenko | ac7d0e3 | 2007-10-08 19:32:12 +0000 | [diff] [blame] | 182 | } |
| 183 | xfunc_die(); |
| 184 | } |
| 185 | |
Denis Vlasenko | defc1ea | 2008-06-27 02:52:20 +0000 | [diff] [blame] | 186 | int FAST_FUNC find_applet_by_name(const char *name) |
Denis Vlasenko | ac7d0e3 | 2007-10-08 19:32:12 +0000 | [diff] [blame] | 187 | { |
Ron Yorston | b220617 | 2016-04-03 22:29:35 +0200 | [diff] [blame] | 188 | unsigned i, max; |
| 189 | int j; |
Denis Vlasenko | 745cd17 | 2007-11-29 03:31:20 +0000 | [diff] [blame] | 190 | const char *p; |
Ron Yorston | 610c4c3 | 2016-03-30 00:42:05 +0200 | [diff] [blame] | 191 | |
Denys Vlasenko | a93e4fd | 2016-04-02 22:54:23 +0200 | [diff] [blame] | 192 | /* The commented-out word-at-a-time code is ~40% faster, but +160 bytes. |
| 193 | * "Faster" here saves ~0.5 microsecond of real time - not worth it. |
| 194 | */ |
| 195 | #if 0 /*BB_UNALIGNED_MEMACCESS_OK && BB_LITTLE_ENDIAN*/ |
| 196 | uint32_t n32; |
| 197 | |
| 198 | /* Handle all names < 2 chars long early */ |
| 199 | if (name[0] == '\0') |
| 200 | return -1; /* "" is not a valid applet name */ |
| 201 | if (name[1] == '\0') { |
| 202 | if (!ENABLE_TEST) |
| 203 | return -1; /* 1-char name is not valid */ |
| 204 | if (name[0] != ']') |
| 205 | return -1; /* 1-char name which isn't "[" is not valid */ |
| 206 | /* applet "[" is always applet #0: */ |
| 207 | return 0; |
| 208 | } |
| 209 | #endif |
| 210 | |
Ron Yorston | 610c4c3 | 2016-03-30 00:42:05 +0200 | [diff] [blame] | 211 | p = applet_names; |
| 212 | i = 0; |
| 213 | #if KNOWN_APPNAME_OFFSETS <= 0 |
| 214 | max = NUM_APPLETS; |
Denis Vlasenko | 79cedcb | 2008-04-08 21:13:28 +0000 | [diff] [blame] | 215 | #else |
Ron Yorston | 610c4c3 | 2016-03-30 00:42:05 +0200 | [diff] [blame] | 216 | max = NUM_APPLETS * KNOWN_APPNAME_OFFSETS; |
| 217 | for (j = ARRAY_SIZE(applet_nameofs)-1; j >= 0; j--) { |
| 218 | const char *pp = applet_names + applet_nameofs[j]; |
| 219 | if (strcmp(name, pp) >= 0) { |
| 220 | //bb_error_msg("name:'%s' >= pp:'%s'", name, pp); |
| 221 | p = pp; |
| 222 | i = max - NUM_APPLETS; |
| 223 | break; |
| 224 | } |
| 225 | max -= NUM_APPLETS; |
| 226 | } |
| 227 | max /= (unsigned)KNOWN_APPNAME_OFFSETS; |
| 228 | i /= (unsigned)KNOWN_APPNAME_OFFSETS; |
| 229 | //bb_error_msg("name:'%s' starting from:'%s' i:%u max:%u", name, p, i, max); |
| 230 | #endif |
| 231 | |
Denys Vlasenko | 1cf68e3 | 2016-04-02 22:57:17 +0200 | [diff] [blame] | 232 | /* Open-coded linear search without strcmp/strlen calls for speed */ |
Denys Vlasenko | a93e4fd | 2016-04-02 22:54:23 +0200 | [diff] [blame] | 233 | |
| 234 | #if 0 /*BB_UNALIGNED_MEMACCESS_OK && BB_LITTLE_ENDIAN*/ |
| 235 | /* skip "[\0" name, it's surely not it */ |
| 236 | if (ENABLE_TEST && LONE_CHAR(p, '[')) |
| 237 | i++, p += 2; |
| 238 | /* All remaining applet names in p[] are at least 2 chars long */ |
| 239 | /* name[] is also at least 2 chars long */ |
| 240 | |
| 241 | n32 = (name[0] << 0) | (name[1] << 8) | (name[2] << 16); |
| 242 | while (i < max) { |
| 243 | uint32_t p32; |
| 244 | char ch; |
| 245 | |
| 246 | /* Quickly check match of the first 3 bytes */ |
| 247 | move_from_unaligned32(p32, p); |
| 248 | p += 3; |
| 249 | if ((p32 & 0x00ffffff) != n32) { |
| 250 | /* Most likely case: 3 first bytes do not match */ |
| 251 | i++; |
| 252 | if ((p32 & 0x00ff0000) == '\0') |
| 253 | continue; // p[2] was NUL |
| 254 | p++; |
| 255 | if ((p32 & 0xff000000) == '\0') |
| 256 | continue; // p[3] was NUL |
| 257 | /* p[0..3] aren't matching and none is NUL, check the rest */ |
| 258 | while (*p++ != '\0') |
| 259 | continue; |
| 260 | continue; |
| 261 | } |
| 262 | |
| 263 | /* Unlikely branch: first 3 bytes ([0..2]) match */ |
| 264 | if ((p32 & 0x00ff0000) == '\0') { |
| 265 | /* name is 2-byte long, it is full match */ |
| 266 | //bb_error_msg("found:'%s' i:%u", name, i); |
| 267 | return i; |
| 268 | } |
| 269 | /* Check remaining bytes [3..NUL] */ |
| 270 | ch = (p32 >> 24); |
| 271 | j = 3; |
| 272 | while (ch == name[j]) { |
| 273 | if (ch == '\0') { |
| 274 | //bb_error_msg("found:'%s' i:%u", name, i); |
| 275 | return i; |
| 276 | } |
| 277 | ch = *++p; |
| 278 | j++; |
| 279 | } |
| 280 | /* Not a match. Skip it, including NUL */ |
| 281 | while (ch != '\0') |
| 282 | ch = *++p; |
| 283 | p++; |
| 284 | i++; |
| 285 | } |
| 286 | return -1; |
| 287 | #else |
Ron Yorston | 610c4c3 | 2016-03-30 00:42:05 +0200 | [diff] [blame] | 288 | while (i < max) { |
| 289 | char ch; |
| 290 | j = 0; |
| 291 | /* Do we see "name\0" in applet_names[p] position? */ |
| 292 | while ((ch = *p) == name[j]) { |
| 293 | if (ch == '\0') { |
| 294 | //bb_error_msg("found:'%s' i:%u", name, i); |
| 295 | return i; /* yes */ |
| 296 | } |
| 297 | p++; |
| 298 | j++; |
| 299 | } |
| 300 | /* No. |
| 301 | * p => 1st non-matching char in applet_names[], |
| 302 | * skip to and including NUL. |
| 303 | */ |
| 304 | while (ch != '\0') |
| 305 | ch = *++p; |
| 306 | p++; |
Denis Vlasenko | 79cedcb | 2008-04-08 21:13:28 +0000 | [diff] [blame] | 307 | i++; |
| 308 | } |
| 309 | return -1; |
Denys Vlasenko | a93e4fd | 2016-04-02 22:54:23 +0200 | [diff] [blame] | 310 | #endif |
Denis Vlasenko | ac7d0e3 | 2007-10-08 19:32:12 +0000 | [diff] [blame] | 311 | } |
| 312 | |
| 313 | |
Denis Vlasenko | 68404f1 | 2008-03-17 09:00:54 +0000 | [diff] [blame] | 314 | void lbb_prepare(const char *applet |
Denis Vlasenko | 5e34ff2 | 2009-04-21 11:09:40 +0000 | [diff] [blame] | 315 | IF_FEATURE_INDIVIDUAL(, char **argv)) |
Denis Vlasenko | 468aea2 | 2008-04-01 14:47:57 +0000 | [diff] [blame] | 316 | MAIN_EXTERNALLY_VISIBLE; |
| 317 | void lbb_prepare(const char *applet |
Denis Vlasenko | 5e34ff2 | 2009-04-21 11:09:40 +0000 | [diff] [blame] | 318 | IF_FEATURE_INDIVIDUAL(, char **argv)) |
Denis Vlasenko | ac7d0e3 | 2007-10-08 19:32:12 +0000 | [diff] [blame] | 319 | { |
| 320 | #ifdef __GLIBC__ |
| 321 | (*(int **)&bb_errno) = __errno_location(); |
Denis Vlasenko | 574f2f4 | 2008-02-27 18:41:59 +0000 | [diff] [blame] | 322 | barrier(); |
Denis Vlasenko | ac7d0e3 | 2007-10-08 19:32:12 +0000 | [diff] [blame] | 323 | #endif |
Denis Vlasenko | 15cb4a4 | 2007-10-11 10:06:26 +0000 | [diff] [blame] | 324 | applet_name = applet; |
Denis Vlasenko | ac7d0e3 | 2007-10-08 19:32:12 +0000 | [diff] [blame] | 325 | |
Denys Vlasenko | 45b4ecc | 2014-08-11 20:33:18 +0200 | [diff] [blame] | 326 | if (ENABLE_LOCALE_SUPPORT) |
Denis Vlasenko | ac7d0e3 | 2007-10-08 19:32:12 +0000 | [diff] [blame] | 327 | setlocale(LC_ALL, ""); |
| 328 | |
Denis Vlasenko | 82d38da | 2007-10-10 14:38:47 +0000 | [diff] [blame] | 329 | #if ENABLE_FEATURE_INDIVIDUAL |
| 330 | /* Redundant for busybox (run_applet_and_exit covers that case) |
| 331 | * but needed for "individual applet" mode */ |
Denys Vlasenko | 9297dbc | 2010-07-05 21:37:12 +0200 | [diff] [blame] | 332 | if (argv[1] |
| 333 | && !argv[2] |
| 334 | && strcmp(argv[1], "--help") == 0 |
Denys Vlasenko | 8dff01d | 2015-03-12 17:48:34 +0100 | [diff] [blame] | 335 | && !is_prefixed_with(applet, "busybox") |
Denys Vlasenko | 9297dbc | 2010-07-05 21:37:12 +0200 | [diff] [blame] | 336 | ) { |
Denis Vlasenko | bd28f6b | 2008-07-19 08:15:13 +0000 | [diff] [blame] | 337 | /* Special case. POSIX says "test --help" |
| 338 | * should be no different from e.g. "test --foo". */ |
| 339 | if (!ENABLE_TEST || strcmp(applet_name, "test") != 0) |
| 340 | bb_show_usage(); |
| 341 | } |
Denis Vlasenko | 82d38da | 2007-10-10 14:38:47 +0000 | [diff] [blame] | 342 | #endif |
Denis Vlasenko | ac7d0e3 | 2007-10-08 19:32:12 +0000 | [diff] [blame] | 343 | } |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 344 | |
| 345 | /* The code below can well be in applets/applets.c, as it is used only |
| 346 | * for busybox binary, not "individual" binaries. |
| 347 | * However, keeping it here and linking it into libbusybox.so |
| 348 | * (together with remaining tiny applets/applets.o) |
| 349 | * makes it possible to avoid --whole-archive at link time. |
| 350 | * This makes (shared busybox) + libbusybox smaller. |
| 351 | * (--gc-sections would be even better....) |
| 352 | */ |
| 353 | |
| 354 | const char *applet_name; |
| 355 | #if !BB_MMU |
| 356 | bool re_execed; |
| 357 | #endif |
| 358 | |
Denis Vlasenko | 468aea2 | 2008-04-01 14:47:57 +0000 | [diff] [blame] | 359 | |
Denis Vlasenko | 10f6fb1 | 2008-04-29 00:10:27 +0000 | [diff] [blame] | 360 | /* If not built as a single-applet executable... */ |
| 361 | #if !defined(SINGLE_APPLET_MAIN) |
Denis Vlasenko | 468aea2 | 2008-04-01 14:47:57 +0000 | [diff] [blame] | 362 | |
Denis Vlasenko | 5e34ff2 | 2009-04-21 11:09:40 +0000 | [diff] [blame] | 363 | IF_FEATURE_SUID(static uid_t ruid;) /* real uid */ |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 364 | |
Denys Vlasenko | 8f0af3b | 2010-11-29 02:55:35 +0100 | [diff] [blame] | 365 | # if ENABLE_FEATURE_SUID_CONFIG |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 366 | |
Denys Vlasenko | 9be4702 | 2011-05-16 12:21:31 +0200 | [diff] [blame] | 367 | static struct suid_config_t { |
| 368 | /* next ptr must be first: this struct needs to be llist-compatible */ |
| 369 | struct suid_config_t *m_next; |
Denys Vlasenko | 4566e17 | 2011-05-16 00:01:08 +0200 | [diff] [blame] | 370 | struct bb_uidgid_t m_ugid; |
Denys Vlasenko | 9be4702 | 2011-05-16 12:21:31 +0200 | [diff] [blame] | 371 | int m_applet; |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 372 | mode_t m_mode; |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 373 | } *suid_config; |
| 374 | |
| 375 | static bool suid_cfg_readable; |
| 376 | |
Denys Vlasenko | d83aff1 | 2011-05-16 13:53:19 +0200 | [diff] [blame] | 377 | /* libbb candidate */ |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 378 | static char *get_trimmed_slice(char *s, char *e) |
| 379 | { |
| 380 | /* First, consider the value at e to be nul and back up until we |
| 381 | * reach a non-space char. Set the char after that (possibly at |
| 382 | * the original e) to nul. */ |
| 383 | while (e-- > s) { |
| 384 | if (!isspace(*e)) { |
| 385 | break; |
| 386 | } |
| 387 | } |
| 388 | e[1] = '\0'; |
| 389 | |
| 390 | /* Next, advance past all leading space and return a ptr to the |
| 391 | * first non-space char; possibly the terminating nul. */ |
| 392 | return skip_whitespace(s); |
| 393 | } |
| 394 | |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 395 | static void parse_config_file(void) |
| 396 | { |
Denys Vlasenko | 3770b6b | 2011-05-16 13:19:25 +0200 | [diff] [blame] | 397 | /* Don't depend on the tools to combine strings. */ |
| 398 | static const char config_file[] ALIGN1 = "/etc/busybox.conf"; |
| 399 | |
Denys Vlasenko | 9be4702 | 2011-05-16 12:21:31 +0200 | [diff] [blame] | 400 | struct suid_config_t *sct_head; |
Denis Vlasenko | 1aa7e47 | 2007-11-28 06:49:03 +0000 | [diff] [blame] | 401 | int applet_no; |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 402 | FILE *f; |
| 403 | const char *errmsg; |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 404 | unsigned lc; |
| 405 | smallint section; |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 406 | struct stat st; |
| 407 | |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 408 | ruid = getuid(); |
| 409 | if (ruid == 0) /* run by root - don't need to even read config file */ |
| 410 | return; |
| 411 | |
| 412 | if ((stat(config_file, &st) != 0) /* No config file? */ |
| 413 | || !S_ISREG(st.st_mode) /* Not a regular file? */ |
| 414 | || (st.st_uid != 0) /* Not owned by root? */ |
| 415 | || (st.st_mode & (S_IWGRP | S_IWOTH)) /* Writable by non-root? */ |
Denys Vlasenko | 4566e17 | 2011-05-16 00:01:08 +0200 | [diff] [blame] | 416 | || !(f = fopen_for_read(config_file)) /* Cannot open? */ |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 417 | ) { |
| 418 | return; |
| 419 | } |
| 420 | |
| 421 | suid_cfg_readable = 1; |
| 422 | sct_head = NULL; |
| 423 | section = lc = 0; |
| 424 | |
| 425 | while (1) { |
Denys Vlasenko | 9be4702 | 2011-05-16 12:21:31 +0200 | [diff] [blame] | 426 | char buffer[256]; |
| 427 | char *s; |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 428 | |
Denys Vlasenko | 9be4702 | 2011-05-16 12:21:31 +0200 | [diff] [blame] | 429 | if (!fgets(buffer, sizeof(buffer), f)) { /* Are we done? */ |
Denys Vlasenko | 4566e17 | 2011-05-16 00:01:08 +0200 | [diff] [blame] | 430 | // Looks like bloat |
| 431 | //if (ferror(f)) { /* Make sure it wasn't a read error. */ |
| 432 | // errmsg = "reading"; |
| 433 | // goto pe_label; |
| 434 | //} |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 435 | fclose(f); |
| 436 | suid_config = sct_head; /* Success, so set the pointer. */ |
| 437 | return; |
| 438 | } |
| 439 | |
Denys Vlasenko | 9be4702 | 2011-05-16 12:21:31 +0200 | [diff] [blame] | 440 | s = buffer; |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 441 | lc++; /* Got a (partial) line. */ |
| 442 | |
| 443 | /* If a line is too long for our buffer, we consider it an error. |
| 444 | * The following test does mistreat one corner case though. |
| 445 | * If the final line of the file does not end with a newline and |
| 446 | * yet exactly fills the buffer, it will be treated as too long |
| 447 | * even though there isn't really a problem. But it isn't really |
| 448 | * worth adding code to deal with such an unlikely situation, and |
| 449 | * we do err on the side of caution. Besides, the line would be |
| 450 | * too long if it did end with a newline. */ |
| 451 | if (!strchr(s, '\n') && !feof(f)) { |
Denys Vlasenko | 4566e17 | 2011-05-16 00:01:08 +0200 | [diff] [blame] | 452 | errmsg = "line too long"; |
| 453 | goto pe_label; |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 454 | } |
| 455 | |
| 456 | /* Trim leading and trailing whitespace, ignoring comments, and |
| 457 | * check if the resulting string is empty. */ |
| 458 | s = get_trimmed_slice(s, strchrnul(s, '#')); |
| 459 | if (!*s) { |
| 460 | continue; |
| 461 | } |
| 462 | |
| 463 | /* Check for a section header. */ |
| 464 | |
| 465 | if (*s == '[') { |
| 466 | /* Unlike the old code, we ignore leading and trailing |
| 467 | * whitespace for the section name. We also require that |
| 468 | * there are no stray characters after the closing bracket. */ |
Denys Vlasenko | 9be4702 | 2011-05-16 12:21:31 +0200 | [diff] [blame] | 469 | char *e = strchr(s, ']'); |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 470 | if (!e /* Missing right bracket? */ |
| 471 | || e[1] /* Trailing characters? */ |
| 472 | || !*(s = get_trimmed_slice(s+1, e)) /* Missing name? */ |
| 473 | ) { |
Denys Vlasenko | 4566e17 | 2011-05-16 00:01:08 +0200 | [diff] [blame] | 474 | errmsg = "section header"; |
| 475 | goto pe_label; |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 476 | } |
| 477 | /* Right now we only have one section so just check it. |
| 478 | * If more sections are added in the future, please don't |
| 479 | * resort to cascading ifs with multiple strcasecmp calls. |
| 480 | * That kind of bloated code is all too common. A loop |
| 481 | * and a string table would be a better choice unless the |
| 482 | * number of sections is very small. */ |
| 483 | if (strcasecmp(s, "SUID") == 0) { |
| 484 | section = 1; |
| 485 | continue; |
| 486 | } |
| 487 | section = -1; /* Unknown section so set to skip. */ |
| 488 | continue; |
| 489 | } |
| 490 | |
| 491 | /* Process sections. */ |
| 492 | |
| 493 | if (section == 1) { /* SUID */ |
| 494 | /* Since we trimmed leading and trailing space above, we're |
| 495 | * now looking for strings of the form |
| 496 | * <key>[::space::]*=[::space::]*<value> |
| 497 | * where both key and value could contain inner whitespace. */ |
| 498 | |
| 499 | /* First get the key (an applet name in our case). */ |
Denys Vlasenko | 9be4702 | 2011-05-16 12:21:31 +0200 | [diff] [blame] | 500 | char *e = strchr(s, '='); |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 501 | if (e) { |
| 502 | s = get_trimmed_slice(s, e); |
| 503 | } |
| 504 | if (!e || !*s) { /* Missing '=' or empty key. */ |
Denys Vlasenko | 4566e17 | 2011-05-16 00:01:08 +0200 | [diff] [blame] | 505 | errmsg = "keyword"; |
| 506 | goto pe_label; |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 507 | } |
| 508 | |
| 509 | /* Ok, we have an applet name. Process the rhs if this |
| 510 | * applet is currently built in and ignore it otherwise. |
| 511 | * Note: this can hide config file bugs which only pop |
| 512 | * up when the busybox configuration is changed. */ |
Denis Vlasenko | 1aa7e47 | 2007-11-28 06:49:03 +0000 | [diff] [blame] | 513 | applet_no = find_applet_by_name(s); |
| 514 | if (applet_no >= 0) { |
Denys Vlasenko | 3770b6b | 2011-05-16 13:19:25 +0200 | [diff] [blame] | 515 | unsigned i; |
Denys Vlasenko | 9be4702 | 2011-05-16 12:21:31 +0200 | [diff] [blame] | 516 | struct suid_config_t *sct; |
| 517 | |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 518 | /* Note: We currently don't check for duplicates! |
| 519 | * The last config line for each applet will be the |
| 520 | * one used since we insert at the head of the list. |
| 521 | * I suppose this could be considered a feature. */ |
Denys Vlasenko | 4566e17 | 2011-05-16 00:01:08 +0200 | [diff] [blame] | 522 | sct = xzalloc(sizeof(*sct)); |
Denis Vlasenko | 1aa7e47 | 2007-11-28 06:49:03 +0000 | [diff] [blame] | 523 | sct->m_applet = applet_no; |
Denys Vlasenko | 4566e17 | 2011-05-16 00:01:08 +0200 | [diff] [blame] | 524 | /*sct->m_mode = 0;*/ |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 525 | sct->m_next = sct_head; |
| 526 | sct_head = sct; |
| 527 | |
| 528 | /* Get the specified mode. */ |
| 529 | |
| 530 | e = skip_whitespace(e+1); |
| 531 | |
| 532 | for (i = 0; i < 3; i++) { |
Denys Vlasenko | 3770b6b | 2011-05-16 13:19:25 +0200 | [diff] [blame] | 533 | /* There are 4 chars for each of user/group/other. |
| 534 | * "x-xx" instead of "x-" are to make |
| 535 | * "idx > 3" check catch invalid chars. |
| 536 | */ |
| 537 | static const char mode_chars[] ALIGN1 = "Ssx-" "Ssx-" "x-xx"; |
| 538 | static const unsigned short mode_mask[] ALIGN2 = { |
| 539 | S_ISUID, S_ISUID|S_IXUSR, S_IXUSR, 0, /* Ssx- */ |
| 540 | S_ISGID, S_ISGID|S_IXGRP, S_IXGRP, 0, /* Ssx- */ |
| 541 | S_IXOTH, 0 /* x- */ |
| 542 | }; |
| 543 | const char *q = strchrnul(mode_chars + 4*i, *e); |
| 544 | unsigned idx = q - (mode_chars + 4*i); |
| 545 | if (idx > 3) { |
Denys Vlasenko | 4566e17 | 2011-05-16 00:01:08 +0200 | [diff] [blame] | 546 | errmsg = "mode"; |
| 547 | goto pe_label; |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 548 | } |
Denys Vlasenko | 3770b6b | 2011-05-16 13:19:25 +0200 | [diff] [blame] | 549 | sct->m_mode |= mode_mask[q - mode_chars]; |
| 550 | e++; |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 551 | } |
| 552 | |
Marek Polacek | b0b8884 | 2011-04-16 17:33:43 +0200 | [diff] [blame] | 553 | /* Now get the user/group info. */ |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 554 | |
| 555 | s = skip_whitespace(e); |
Denys Vlasenko | 351fec3 | 2011-05-16 14:30:26 +0200 | [diff] [blame] | 556 | /* Default is 0.0, else parse USER.GROUP: */ |
| 557 | if (*s) { |
| 558 | /* We require whitespace between mode and USER.GROUP */ |
| 559 | if ((s == e) || !(e = strchr(s, '.'))) { |
| 560 | errmsg = "uid.gid"; |
| 561 | goto pe_label; |
| 562 | } |
| 563 | *e = ':'; /* get_uidgid needs USER:GROUP syntax */ |
Denys Vlasenko | 526d858 | 2015-10-19 04:27:17 +0200 | [diff] [blame] | 564 | if (get_uidgid(&sct->m_ugid, s) == 0) { |
Denys Vlasenko | 351fec3 | 2011-05-16 14:30:26 +0200 | [diff] [blame] | 565 | errmsg = "unknown user/group"; |
| 566 | goto pe_label; |
| 567 | } |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 568 | } |
| 569 | } |
| 570 | continue; |
| 571 | } |
| 572 | |
| 573 | /* Unknown sections are ignored. */ |
| 574 | |
| 575 | /* Encountering configuration lines prior to seeing a |
| 576 | * section header is treated as an error. This is how |
| 577 | * the old code worked, but it may not be desirable. |
| 578 | * We may want to simply ignore such lines in case they |
| 579 | * are used in some future version of busybox. */ |
| 580 | if (!section) { |
Denys Vlasenko | 4566e17 | 2011-05-16 00:01:08 +0200 | [diff] [blame] | 581 | errmsg = "keyword outside section"; |
| 582 | goto pe_label; |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 583 | } |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 584 | } /* while (1) */ |
| 585 | |
| 586 | pe_label: |
Denys Vlasenko | 9be4702 | 2011-05-16 12:21:31 +0200 | [diff] [blame] | 587 | fclose(f); |
Denys Vlasenko | 4566e17 | 2011-05-16 00:01:08 +0200 | [diff] [blame] | 588 | 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] | 589 | |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 590 | /* Release any allocated memory before returning. */ |
Denys Vlasenko | 9be4702 | 2011-05-16 12:21:31 +0200 | [diff] [blame] | 591 | llist_free((llist_t*)sct_head, NULL); |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 592 | } |
Denys Vlasenko | 8f0af3b | 2010-11-29 02:55:35 +0100 | [diff] [blame] | 593 | # else |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 594 | static inline void parse_config_file(void) |
| 595 | { |
Denis Vlasenko | 5e34ff2 | 2009-04-21 11:09:40 +0000 | [diff] [blame] | 596 | IF_FEATURE_SUID(ruid = getuid();) |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 597 | } |
Denys Vlasenko | 8f0af3b | 2010-11-29 02:55:35 +0100 | [diff] [blame] | 598 | # endif /* FEATURE_SUID_CONFIG */ |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 599 | |
| 600 | |
Denys Vlasenko | 9cc3d3a | 2016-12-23 02:42:26 +0100 | [diff] [blame] | 601 | # if ENABLE_FEATURE_SUID && NUM_APPLETS > 0 |
Cristian Ionescu-Idbohrn | f1d76b6 | 2017-01-02 11:17:09 +0100 | [diff] [blame] | 602 | # if ENABLE_FEATURE_SUID_CONFIG |
Denys Vlasenko | 9cc3d3a | 2016-12-23 02:42:26 +0100 | [diff] [blame] | 603 | /* check if u is member of group g */ |
| 604 | static int ingroup(uid_t u, gid_t g) |
| 605 | { |
| 606 | struct group *grp = getgrgid(g); |
| 607 | if (grp) { |
| 608 | char **mem; |
| 609 | for (mem = grp->gr_mem; *mem; mem++) { |
| 610 | struct passwd *pwd = getpwnam(*mem); |
| 611 | if (pwd && (pwd->pw_uid == u)) |
| 612 | return 1; |
| 613 | } |
| 614 | } |
| 615 | return 0; |
| 616 | } |
Cristian Ionescu-Idbohrn | f1d76b6 | 2017-01-02 11:17:09 +0100 | [diff] [blame] | 617 | # endif |
Denys Vlasenko | 9cc3d3a | 2016-12-23 02:42:26 +0100 | [diff] [blame] | 618 | |
Denis Vlasenko | 1aa7e47 | 2007-11-28 06:49:03 +0000 | [diff] [blame] | 619 | static void check_suid(int applet_no) |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 620 | { |
| 621 | gid_t rgid; /* real gid */ |
| 622 | |
| 623 | if (ruid == 0) /* set by parse_config_file() */ |
| 624 | return; /* run by root - no need to check more */ |
| 625 | rgid = getgid(); |
| 626 | |
Denys Vlasenko | 8f0af3b | 2010-11-29 02:55:35 +0100 | [diff] [blame] | 627 | # if ENABLE_FEATURE_SUID_CONFIG |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 628 | if (suid_cfg_readable) { |
| 629 | uid_t uid; |
Denys Vlasenko | 9be4702 | 2011-05-16 12:21:31 +0200 | [diff] [blame] | 630 | struct suid_config_t *sct; |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 631 | mode_t m; |
| 632 | |
| 633 | for (sct = suid_config; sct; sct = sct->m_next) { |
Denis Vlasenko | 1aa7e47 | 2007-11-28 06:49:03 +0000 | [diff] [blame] | 634 | if (sct->m_applet == applet_no) |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 635 | goto found; |
| 636 | } |
Denis Vlasenko | 15ca51e | 2007-10-29 19:25:45 +0000 | [diff] [blame] | 637 | goto check_need_suid; |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 638 | found: |
Denys Vlasenko | 3770b6b | 2011-05-16 13:19:25 +0200 | [diff] [blame] | 639 | /* Is this user allowed to run this applet? */ |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 640 | m = sct->m_mode; |
Denys Vlasenko | 4566e17 | 2011-05-16 00:01:08 +0200 | [diff] [blame] | 641 | if (sct->m_ugid.uid == ruid) |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 642 | /* same uid */ |
| 643 | m >>= 6; |
Denys Vlasenko | 4566e17 | 2011-05-16 00:01:08 +0200 | [diff] [blame] | 644 | 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] | 645 | /* same group / in group */ |
| 646 | m >>= 3; |
Denys Vlasenko | 3770b6b | 2011-05-16 13:19:25 +0200 | [diff] [blame] | 647 | if (!(m & S_IXOTH)) /* is x bit not set? */ |
Denys Vlasenko | d83aff1 | 2011-05-16 13:53:19 +0200 | [diff] [blame] | 648 | 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] | 649 | |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 650 | /* We set effective AND saved ids. If saved-id is not set |
Denys Vlasenko | 3770b6b | 2011-05-16 13:19:25 +0200 | [diff] [blame] | 651 | * like we do below, seteuid(0) can still later succeed! */ |
| 652 | |
| 653 | /* Are we directed to change gid |
| 654 | * (APPLET = *s* USER.GROUP or APPLET = *S* USER.GROUP)? |
| 655 | */ |
| 656 | if (sct->m_mode & S_ISGID) |
| 657 | rgid = sct->m_ugid.gid; |
| 658 | /* else: we will set egid = rgid, thus dropping sgid effect */ |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 659 | if (setresgid(-1, rgid, rgid)) |
| 660 | bb_perror_msg_and_die("setresgid"); |
| 661 | |
Denys Vlasenko | 3770b6b | 2011-05-16 13:19:25 +0200 | [diff] [blame] | 662 | /* Are we directed to change uid |
| 663 | * (APPLET = s** USER.GROUP or APPLET = S** USER.GROUP)? |
| 664 | */ |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 665 | uid = ruid; |
| 666 | if (sct->m_mode & S_ISUID) |
Denys Vlasenko | 4566e17 | 2011-05-16 00:01:08 +0200 | [diff] [blame] | 667 | uid = sct->m_ugid.uid; |
Denys Vlasenko | 3770b6b | 2011-05-16 13:19:25 +0200 | [diff] [blame] | 668 | /* else: we will set euid = ruid, thus dropping suid effect */ |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 669 | if (setresuid(-1, uid, uid)) |
| 670 | bb_perror_msg_and_die("setresuid"); |
Denys Vlasenko | 3770b6b | 2011-05-16 13:19:25 +0200 | [diff] [blame] | 671 | |
Denys Vlasenko | 9be4702 | 2011-05-16 12:21:31 +0200 | [diff] [blame] | 672 | goto ret; |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 673 | } |
Denys Vlasenko | 8f0af3b | 2010-11-29 02:55:35 +0100 | [diff] [blame] | 674 | # if !ENABLE_FEATURE_SUID_CONFIG_QUIET |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 675 | { |
| 676 | static bool onetime = 0; |
| 677 | |
| 678 | if (!onetime) { |
| 679 | onetime = 1; |
Denys Vlasenko | 9be4702 | 2011-05-16 12:21:31 +0200 | [diff] [blame] | 680 | bb_error_msg("using fallback suid method"); |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 681 | } |
| 682 | } |
Denys Vlasenko | 8f0af3b | 2010-11-29 02:55:35 +0100 | [diff] [blame] | 683 | # endif |
Denis Vlasenko | 15ca51e | 2007-10-29 19:25:45 +0000 | [diff] [blame] | 684 | check_need_suid: |
Denys Vlasenko | 8f0af3b | 2010-11-29 02:55:35 +0100 | [diff] [blame] | 685 | # endif |
Denys Vlasenko | b9f2d9f | 2011-01-18 13:58:01 +0100 | [diff] [blame] | 686 | if (APPLET_SUID(applet_no) == BB_SUID_REQUIRE) { |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 687 | /* Real uid is not 0. If euid isn't 0 too, suid bit |
| 688 | * is most probably not set on our executable */ |
| 689 | if (geteuid()) |
Denis Vlasenko | 15ca51e | 2007-10-29 19:25:45 +0000 | [diff] [blame] | 690 | bb_error_msg_and_die("must be suid to work properly"); |
Denys Vlasenko | b9f2d9f | 2011-01-18 13:58:01 +0100 | [diff] [blame] | 691 | } else if (APPLET_SUID(applet_no) == BB_SUID_DROP) { |
Denys Vlasenko | 12a4f9a | 2017-07-10 09:17:43 +0200 | [diff] [blame] | 692 | /* |
| 693 | * Drop all privileges. |
| 694 | * |
| 695 | * Don't check for errors: in normal use, they are impossible, |
| 696 | * and in special cases, exiting is harmful. Example: |
| 697 | * 'unshare --user' when user's shell is also from busybox. |
| 698 | * |
| 699 | * 'unshare --user' creates a new user namespace without any |
| 700 | * uid mappings. Thus, busybox binary is setuid nobody:nogroup |
| 701 | * within the namespace, as that is the only user. However, |
| 702 | * since no uids are mapped, calls to setgid/setuid |
| 703 | * fail (even though they would do nothing). |
| 704 | */ |
| 705 | setgid(rgid); |
| 706 | setuid(ruid); |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 707 | } |
Denys Vlasenko | 9be4702 | 2011-05-16 12:21:31 +0200 | [diff] [blame] | 708 | # if ENABLE_FEATURE_SUID_CONFIG |
Cristian Ionescu-Idbohrn | ea137aa | 2011-05-20 03:52:36 +0200 | [diff] [blame] | 709 | ret: ; |
Denys Vlasenko | 9be4702 | 2011-05-16 12:21:31 +0200 | [diff] [blame] | 710 | llist_free((llist_t*)suid_config, NULL); |
| 711 | # endif |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 712 | } |
Denys Vlasenko | 8f0af3b | 2010-11-29 02:55:35 +0100 | [diff] [blame] | 713 | # else |
| 714 | # define check_suid(x) ((void)0) |
| 715 | # endif /* FEATURE_SUID */ |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 716 | |
| 717 | |
Denys Vlasenko | 8f0af3b | 2010-11-29 02:55:35 +0100 | [diff] [blame] | 718 | # if ENABLE_FEATURE_INSTALLER |
Denys Vlasenko | 5a7c720 | 2010-04-20 21:02:57 -0400 | [diff] [blame] | 719 | static const char usr_bin [] ALIGN1 = "/usr/bin/"; |
| 720 | static const char usr_sbin[] ALIGN1 = "/usr/sbin/"; |
| 721 | static const char *const install_dir[] = { |
| 722 | &usr_bin [8], /* "/" */ |
| 723 | &usr_bin [4], /* "/bin/" */ |
Denys Vlasenko | d4d289a | 2010-10-12 04:18:05 +0200 | [diff] [blame] | 724 | &usr_sbin[4] /* "/sbin/" */ |
Denys Vlasenko | 8f0af3b | 2010-11-29 02:55:35 +0100 | [diff] [blame] | 725 | # if !ENABLE_INSTALL_NO_USR |
Denys Vlasenko | d4d289a | 2010-10-12 04:18:05 +0200 | [diff] [blame] | 726 | ,usr_bin |
| 727 | ,usr_sbin |
Denys Vlasenko | 8f0af3b | 2010-11-29 02:55:35 +0100 | [diff] [blame] | 728 | # endif |
Denys Vlasenko | 5a7c720 | 2010-04-20 21:02:57 -0400 | [diff] [blame] | 729 | }; |
| 730 | |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 731 | /* create (sym)links for each applet */ |
Denys Vlasenko | 3b40543 | 2009-07-15 00:35:34 +0200 | [diff] [blame] | 732 | static void install_links(const char *busybox, int use_symbolic_links, |
| 733 | char *custom_install_dir) |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 734 | { |
| 735 | /* directory table |
| 736 | * this should be consistent w/ the enum, |
| 737 | * busybox.h::bb_install_loc_t, or else... */ |
Denis Vlasenko | 1aa7e47 | 2007-11-28 06:49:03 +0000 | [diff] [blame] | 738 | int (*lf)(const char *, const char *); |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 739 | char *fpc; |
Denys Vlasenko | 4c201c0 | 2018-07-17 15:04:17 +0200 | [diff] [blame^] | 740 | const char *appname = applet_names; |
Denis Vlasenko | 6b06cb8 | 2008-05-15 21:30:45 +0000 | [diff] [blame] | 741 | unsigned i; |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 742 | int rc; |
| 743 | |
Denis Vlasenko | 1aa7e47 | 2007-11-28 06:49:03 +0000 | [diff] [blame] | 744 | lf = link; |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 745 | if (use_symbolic_links) |
| 746 | lf = symlink; |
| 747 | |
Denis Vlasenko | 745cd17 | 2007-11-29 03:31:20 +0000 | [diff] [blame] | 748 | for (i = 0; i < ARRAY_SIZE(applet_main); i++) { |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 749 | fpc = concat_path_file( |
Denys Vlasenko | 3b40543 | 2009-07-15 00:35:34 +0200 | [diff] [blame] | 750 | custom_install_dir ? custom_install_dir : install_dir[APPLET_INSTALL_LOC(i)], |
Ron Yorston | 610c4c3 | 2016-03-30 00:42:05 +0200 | [diff] [blame] | 751 | appname); |
Denis Vlasenko | 745cd17 | 2007-11-29 03:31:20 +0000 | [diff] [blame] | 752 | // debug: bb_error_msg("%slinking %s to busybox", |
| 753 | // use_symbolic_links ? "sym" : "", fpc); |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 754 | rc = lf(busybox, fpc); |
| 755 | if (rc != 0 && errno != EEXIST) { |
| 756 | bb_simple_perror_msg(fpc); |
| 757 | } |
| 758 | free(fpc); |
Ron Yorston | 610c4c3 | 2016-03-30 00:42:05 +0200 | [diff] [blame] | 759 | while (*appname++ != '\0') |
| 760 | continue; |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 761 | } |
| 762 | } |
Denys Vlasenko | 8e95068 | 2016-05-31 02:42:49 +0200 | [diff] [blame] | 763 | # elif ENABLE_BUSYBOX |
Mike Frysinger | f1999b5 | 2014-01-31 00:29:47 -0500 | [diff] [blame] | 764 | static void install_links(const char *busybox UNUSED_PARAM, |
| 765 | int use_symbolic_links UNUSED_PARAM, |
| 766 | char *custom_install_dir UNUSED_PARAM) |
| 767 | { |
| 768 | } |
Denys Vlasenko | 8f0af3b | 2010-11-29 02:55:35 +0100 | [diff] [blame] | 769 | # endif |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 770 | |
Ron Yorston | 1b0dcc0 | 2016-07-05 14:07:50 +0100 | [diff] [blame] | 771 | static void run_applet_and_exit(const char *name, char **argv) NORETURN; |
| 772 | |
Denys Vlasenko | f128bdb | 2017-07-29 00:59:24 +0200 | [diff] [blame] | 773 | # if ENABLE_BUSYBOX |
| 774 | # if ENABLE_FEATURE_SH_STANDALONE && ENABLE_FEATURE_TAB_COMPLETION |
| 775 | /* |
| 776 | * Insert "busybox" into applet table as well. |
| 777 | * This makes standalone shell tab-complete this name too. |
| 778 | * (Otherwise having "busybox" in applet table is not necessary, |
| 779 | * there is other code which routes "busyboxANY_SUFFIX" name |
| 780 | * to busybox_main()). |
| 781 | */ |
| 782 | //usage:#define busybox_trivial_usage NOUSAGE_STR |
| 783 | //usage:#define busybox_full_usage "" |
| 784 | //applet:IF_BUSYBOX(IF_FEATURE_SH_STANDALONE(IF_FEATURE_TAB_COMPLETION(APPLET(busybox, BB_DIR_BIN, BB_SUID_MAYBE)))) |
| 785 | int busybox_main(int argc, char *argv[]) MAIN_EXTERNALLY_VISIBLE; |
| 786 | # else |
| 787 | # define busybox_main(argc,argv) busybox_main(argv) |
| 788 | static |
| 789 | # endif |
| 790 | int busybox_main(int argc UNUSED_PARAM, char **argv) |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 791 | { |
| 792 | if (!argv[1]) { |
| 793 | /* Called without arguments */ |
Denis Vlasenko | 1aa7e47 | 2007-11-28 06:49:03 +0000 | [diff] [blame] | 794 | const char *a; |
Denys Vlasenko | 0149f02 | 2009-05-19 18:01:42 +0200 | [diff] [blame] | 795 | int col; |
| 796 | unsigned output_width; |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 797 | help: |
Denys Vlasenko | a8a075a | 2017-01-11 10:52:24 +0100 | [diff] [blame] | 798 | output_width = get_terminal_width(2); |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 799 | |
Denis Vlasenko | 21278df | 2008-06-25 12:15:46 +0000 | [diff] [blame] | 800 | dup2(1, 2); |
Denys Vlasenko | 630dde1 | 2009-08-30 19:57:49 +0200 | [diff] [blame] | 801 | full_write2_str(bb_banner); /* reuse const string */ |
| 802 | full_write2_str(" multi-call binary.\n"); /* reuse */ |
| 803 | full_write2_str( |
Aaro Koskinen | 7b729ed | 2015-04-02 00:55:17 +0300 | [diff] [blame] | 804 | "BusyBox is copyrighted by many authors between 1998-2015.\n" |
Bradley M. Kuhn | 0e941d5 | 2012-07-13 11:38:38 -0400 | [diff] [blame] | 805 | "Licensed under GPLv2. See source distribution for detailed\n" |
| 806 | "copyright notices.\n" |
Denys Vlasenko | 5a7c720 | 2010-04-20 21:02:57 -0400 | [diff] [blame] | 807 | "\n" |
Denys Vlasenko | 02b8b9b | 2012-05-14 23:52:57 +0200 | [diff] [blame] | 808 | "Usage: busybox [function [arguments]...]\n" |
Denys Vlasenko | ba88826 | 2012-03-22 11:15:06 +0100 | [diff] [blame] | 809 | " or: busybox --list"IF_FEATURE_INSTALLER("[-full]")"\n" |
| 810 | IF_FEATURE_INSTALLER( |
| 811 | " or: busybox --install [-s] [DIR]\n" |
| 812 | ) |
Denys Vlasenko | 5a7c720 | 2010-04-20 21:02:57 -0400 | [diff] [blame] | 813 | " or: function [arguments]...\n" |
| 814 | "\n" |
Ron Yorston | ae57af6 | 2015-05-30 17:13:52 +0100 | [diff] [blame] | 815 | IF_NOT_FEATURE_SH_STANDALONE( |
Denys Vlasenko | 5a7c720 | 2010-04-20 21:02:57 -0400 | [diff] [blame] | 816 | "\tBusyBox is a multi-call binary that combines many common Unix\n" |
| 817 | "\tutilities into a single executable. Most people will create a\n" |
| 818 | "\tlink to busybox for each function they wish to use and BusyBox\n" |
| 819 | "\twill act like whatever it was invoked as.\n" |
Ron Yorston | ae57af6 | 2015-05-30 17:13:52 +0100 | [diff] [blame] | 820 | ) |
| 821 | IF_FEATURE_SH_STANDALONE( |
| 822 | "\tBusyBox is a multi-call binary that combines many common Unix\n" |
| 823 | "\tutilities into a single executable. The shell in this build\n" |
| 824 | "\tis configured to run built-in utilities without $PATH search.\n" |
| 825 | "\tYou don't need to install a link to busybox for each utility.\n" |
| 826 | "\tTo run external program, use full path (/sbin/ip instead of ip).\n" |
| 827 | ) |
Denys Vlasenko | 5a7c720 | 2010-04-20 21:02:57 -0400 | [diff] [blame] | 828 | "\n" |
| 829 | "Currently defined functions:\n" |
| 830 | ); |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 831 | col = 0; |
Denis Vlasenko | 1aa7e47 | 2007-11-28 06:49:03 +0000 | [diff] [blame] | 832 | a = applet_names; |
Denys Vlasenko | 0149f02 | 2009-05-19 18:01:42 +0200 | [diff] [blame] | 833 | /* prevent last comma to be in the very last pos */ |
| 834 | output_width--; |
Denis Vlasenko | 1aa7e47 | 2007-11-28 06:49:03 +0000 | [diff] [blame] | 835 | while (*a) { |
Denys Vlasenko | 0149f02 | 2009-05-19 18:01:42 +0200 | [diff] [blame] | 836 | int len2 = strlen(a) + 2; |
| 837 | if (col >= (int)output_width - len2) { |
Denis Vlasenko | 79cedcb | 2008-04-08 21:13:28 +0000 | [diff] [blame] | 838 | full_write2_str(",\n"); |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 839 | col = 0; |
| 840 | } |
Denys Vlasenko | 0149f02 | 2009-05-19 18:01:42 +0200 | [diff] [blame] | 841 | if (col == 0) { |
| 842 | col = 6; |
| 843 | full_write2_str("\t"); |
| 844 | } else { |
| 845 | full_write2_str(", "); |
| 846 | } |
Denis Vlasenko | 79cedcb | 2008-04-08 21:13:28 +0000 | [diff] [blame] | 847 | full_write2_str(a); |
Denys Vlasenko | 0149f02 | 2009-05-19 18:01:42 +0200 | [diff] [blame] | 848 | col += len2; |
| 849 | a += len2 - 1; |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 850 | } |
Denys Vlasenko | 7d877fc | 2016-11-28 01:29:28 +0100 | [diff] [blame] | 851 | full_write2_str("\n"); |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 852 | return 0; |
| 853 | } |
| 854 | |
Denys Vlasenko | 8dff01d | 2015-03-12 17:48:34 +0100 | [diff] [blame] | 855 | if (is_prefixed_with(argv[1], "--list")) { |
Denys Vlasenko | 5a7c720 | 2010-04-20 21:02:57 -0400 | [diff] [blame] | 856 | unsigned i = 0; |
| 857 | const char *a = applet_names; |
| 858 | dup2(1, 2); |
| 859 | while (*a) { |
Denys Vlasenko | 8e95068 | 2016-05-31 02:42:49 +0200 | [diff] [blame] | 860 | # if ENABLE_FEATURE_INSTALLER |
Denys Vlasenko | ba88826 | 2012-03-22 11:15:06 +0100 | [diff] [blame] | 861 | if (argv[1][6]) /* --list-full? */ |
Denys Vlasenko | 5a7c720 | 2010-04-20 21:02:57 -0400 | [diff] [blame] | 862 | full_write2_str(install_dir[APPLET_INSTALL_LOC(i)] + 1); |
Denys Vlasenko | 8e95068 | 2016-05-31 02:42:49 +0200 | [diff] [blame] | 863 | # endif |
Denys Vlasenko | 5a7c720 | 2010-04-20 21:02:57 -0400 | [diff] [blame] | 864 | full_write2_str(a); |
| 865 | full_write2_str("\n"); |
| 866 | i++; |
Ron Yorston | 2b91958 | 2016-04-08 11:57:20 +0100 | [diff] [blame] | 867 | while (*a++ != '\0') |
| 868 | continue; |
Denys Vlasenko | 5a7c720 | 2010-04-20 21:02:57 -0400 | [diff] [blame] | 869 | } |
| 870 | return 0; |
| 871 | } |
| 872 | |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 873 | if (ENABLE_FEATURE_INSTALLER && strcmp(argv[1], "--install") == 0) { |
Denys Vlasenko | 3b40543 | 2009-07-15 00:35:34 +0200 | [diff] [blame] | 874 | int use_symbolic_links; |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 875 | const char *busybox; |
Denys Vlasenko | 4a2a86d | 2011-03-06 06:02:31 +0100 | [diff] [blame] | 876 | |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 877 | busybox = xmalloc_readlink(bb_busybox_exec_path); |
Denys Vlasenko | 4a2a86d | 2011-03-06 06:02:31 +0100 | [diff] [blame] | 878 | if (!busybox) { |
| 879 | /* bb_busybox_exec_path is usually "/proc/self/exe". |
| 880 | * In chroot, readlink("/proc/self/exe") usually fails. |
| 881 | * In such case, better use argv[0] as symlink target |
| 882 | * if it is a full path name. |
| 883 | */ |
Denys Vlasenko | 5c94271 | 2011-03-12 06:08:28 +0100 | [diff] [blame] | 884 | if (argv[0][0] != '/') |
| 885 | bb_error_msg_and_die("'%s' is not an absolute path", argv[0]); |
| 886 | busybox = argv[0]; |
Denys Vlasenko | 4a2a86d | 2011-03-06 06:02:31 +0100 | [diff] [blame] | 887 | } |
| 888 | /* busybox --install [-s] [DIR]: |
| 889 | * -s: make symlinks |
| 890 | * DIR: directory to install links to |
| 891 | */ |
Denys Vlasenko | ba88826 | 2012-03-22 11:15:06 +0100 | [diff] [blame] | 892 | use_symbolic_links = (argv[2] && strcmp(argv[2], "-s") == 0 && ++argv); |
Denys Vlasenko | 3b40543 | 2009-07-15 00:35:34 +0200 | [diff] [blame] | 893 | install_links(busybox, use_symbolic_links, argv[2]); |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 894 | return 0; |
| 895 | } |
| 896 | |
| 897 | if (strcmp(argv[1], "--help") == 0) { |
| 898 | /* "busybox --help [<applet>]" */ |
| 899 | if (!argv[2]) |
| 900 | goto help; |
| 901 | /* convert to "<applet> --help" */ |
| 902 | argv[0] = argv[2]; |
| 903 | argv[2] = NULL; |
| 904 | } else { |
| 905 | /* "busybox <applet> arg1 arg2 ..." */ |
| 906 | argv++; |
| 907 | } |
| 908 | /* We support "busybox /a/path/to/applet args..." too. Allows for |
| 909 | * "#!/bin/busybox"-style wrappers */ |
| 910 | applet_name = bb_get_last_path_component_nostrip(argv[0]); |
| 911 | run_applet_and_exit(applet_name, argv); |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 912 | } |
Denys Vlasenko | 8e95068 | 2016-05-31 02:42:49 +0200 | [diff] [blame] | 913 | # endif |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 914 | |
Denys Vlasenko | f4f8fe8 | 2016-07-05 21:43:28 +0200 | [diff] [blame] | 915 | # if NUM_APPLETS > 0 |
Denys Vlasenko | 69a5ec9 | 2017-07-07 19:08:56 +0200 | [diff] [blame] | 916 | void FAST_FUNC run_applet_no_and_exit(int applet_no, const char *name, char **argv) |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 917 | { |
Denys Vlasenko | d4e4fdb | 2017-07-03 21:31:16 +0200 | [diff] [blame] | 918 | int argc = string_array_len(argv); |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 919 | |
Denys Vlasenko | 69a5ec9 | 2017-07-07 19:08:56 +0200 | [diff] [blame] | 920 | /* |
| 921 | * We do not use argv[0]: do not want to repeat massaging of |
| 922 | * "-/sbin/halt" -> "halt", for example. |
| 923 | */ |
| 924 | applet_name = name; |
Denys Vlasenko | cd7a38a | 2014-09-18 00:47:05 +0200 | [diff] [blame] | 925 | |
Denys Vlasenko | cd7a38a | 2014-09-18 00:47:05 +0200 | [diff] [blame] | 926 | /* Special case. POSIX says "test --help" |
| 927 | * should be no different from e.g. "test --foo". |
| 928 | * Thus for "test", we skip --help check. |
Denys Vlasenko | de5edad | 2015-04-21 16:00:41 +0200 | [diff] [blame] | 929 | * "true" and "false" are also special. |
Denys Vlasenko | cd7a38a | 2014-09-18 00:47:05 +0200 | [diff] [blame] | 930 | */ |
Denys Vlasenko | de5edad | 2015-04-21 16:00:41 +0200 | [diff] [blame] | 931 | if (1 |
Denys Vlasenko | f4f8fe8 | 2016-07-05 21:43:28 +0200 | [diff] [blame] | 932 | # if defined APPLET_NO_test |
Denys Vlasenko | de5edad | 2015-04-21 16:00:41 +0200 | [diff] [blame] | 933 | && applet_no != APPLET_NO_test |
Denys Vlasenko | f4f8fe8 | 2016-07-05 21:43:28 +0200 | [diff] [blame] | 934 | # endif |
| 935 | # if defined APPLET_NO_true |
Denys Vlasenko | de5edad | 2015-04-21 16:00:41 +0200 | [diff] [blame] | 936 | && applet_no != APPLET_NO_true |
Denys Vlasenko | f4f8fe8 | 2016-07-05 21:43:28 +0200 | [diff] [blame] | 937 | # endif |
| 938 | # if defined APPLET_NO_false |
Denys Vlasenko | de5edad | 2015-04-21 16:00:41 +0200 | [diff] [blame] | 939 | && applet_no != APPLET_NO_false |
Denys Vlasenko | f4f8fe8 | 2016-07-05 21:43:28 +0200 | [diff] [blame] | 940 | # endif |
Denys Vlasenko | de5edad | 2015-04-21 16:00:41 +0200 | [diff] [blame] | 941 | ) { |
| 942 | if (argc == 2 && strcmp(argv[1], "--help") == 0) { |
| 943 | /* Make "foo --help" exit with 0: */ |
| 944 | xfunc_error_retval = 0; |
Denis Vlasenko | bd28f6b | 2008-07-19 08:15:13 +0000 | [diff] [blame] | 945 | bb_show_usage(); |
Denys Vlasenko | 5d78355 | 2013-01-17 11:02:21 +0100 | [diff] [blame] | 946 | } |
Denis Vlasenko | bd28f6b | 2008-07-19 08:15:13 +0000 | [diff] [blame] | 947 | } |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 948 | if (ENABLE_FEATURE_SUID) |
Denis Vlasenko | 1aa7e47 | 2007-11-28 06:49:03 +0000 | [diff] [blame] | 949 | check_suid(applet_no); |
Denys Vlasenko | 215b0ca | 2016-08-19 18:23:56 +0200 | [diff] [blame] | 950 | xfunc_error_retval = applet_main[applet_no](argc, argv); |
| 951 | /* Note: applet_main() may also not return (die on a xfunc or such) */ |
| 952 | xfunc_die(); |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 953 | } |
Denys Vlasenko | f4f8fe8 | 2016-07-05 21:43:28 +0200 | [diff] [blame] | 954 | # endif /* NUM_APPLETS > 0 */ |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 955 | |
Denys Vlasenko | 7e8218f | 2016-11-18 21:42:44 +0100 | [diff] [blame] | 956 | # if ENABLE_BUSYBOX || NUM_APPLETS > 0 |
Ron Yorston | ce824ae | 2016-06-07 12:12:07 +0100 | [diff] [blame] | 957 | static NORETURN void run_applet_and_exit(const char *name, char **argv) |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 958 | { |
Denys Vlasenko | 7e8218f | 2016-11-18 21:42:44 +0100 | [diff] [blame] | 959 | # if ENABLE_BUSYBOX |
Denys Vlasenko | 8dff01d | 2015-03-12 17:48:34 +0100 | [diff] [blame] | 960 | if (is_prefixed_with(name, "busybox")) |
Denys Vlasenko | f128bdb | 2017-07-29 00:59:24 +0200 | [diff] [blame] | 961 | exit(busybox_main(/*unused:*/ 0, argv)); |
Denys Vlasenko | 7e8218f | 2016-11-18 21:42:44 +0100 | [diff] [blame] | 962 | # endif |
| 963 | # if NUM_APPLETS > 0 |
Ron Yorston | 610c4c3 | 2016-03-30 00:42:05 +0200 | [diff] [blame] | 964 | /* find_applet_by_name() search is more expensive, so goes second */ |
Denys Vlasenko | f4f8fe8 | 2016-07-05 21:43:28 +0200 | [diff] [blame] | 965 | { |
| 966 | int applet = find_applet_by_name(name); |
| 967 | if (applet >= 0) |
Denys Vlasenko | 69a5ec9 | 2017-07-07 19:08:56 +0200 | [diff] [blame] | 968 | run_applet_no_and_exit(applet, name, argv); |
Denys Vlasenko | f4f8fe8 | 2016-07-05 21:43:28 +0200 | [diff] [blame] | 969 | } |
Denys Vlasenko | 7e8218f | 2016-11-18 21:42:44 +0100 | [diff] [blame] | 970 | # endif |
Ron Yorston | ce824ae | 2016-06-07 12:12:07 +0100 | [diff] [blame] | 971 | |
| 972 | /*bb_error_msg_and_die("applet not found"); - links in printf */ |
| 973 | full_write2_str(applet_name); |
| 974 | full_write2_str(": applet not found\n"); |
| 975 | /* POSIX: "If a command is not found, the exit status shall be 127" */ |
| 976 | exit(127); |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 977 | } |
Denys Vlasenko | 7e8218f | 2016-11-18 21:42:44 +0100 | [diff] [blame] | 978 | # endif |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 979 | |
Denis Vlasenko | 10f6fb1 | 2008-04-29 00:10:27 +0000 | [diff] [blame] | 980 | #endif /* !defined(SINGLE_APPLET_MAIN) */ |
Denis Vlasenko | 468aea2 | 2008-04-01 14:47:57 +0000 | [diff] [blame] | 981 | |
| 982 | |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 983 | #if ENABLE_BUILD_LIBBUSYBOX |
Denis Vlasenko | 85c2471 | 2008-03-17 09:04:04 +0000 | [diff] [blame] | 984 | int lbb_main(char **argv) |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 985 | #else |
Denis Vlasenko | a60f84e | 2008-07-05 09:18:54 +0000 | [diff] [blame] | 986 | int main(int argc UNUSED_PARAM, char **argv) |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 987 | #endif |
| 988 | { |
Denys Vlasenko | bc14f4d | 2016-04-03 16:06:42 +0200 | [diff] [blame] | 989 | #if 0 |
| 990 | /* TODO: find a use for a block of memory between end of .bss |
| 991 | * and end of page. For example, I'm getting "_end:0x812e698 2408 bytes" |
| 992 | * - more than 2k of wasted memory (in this particular build) |
| 993 | * *per each running process*! |
| 994 | * (If your linker does not generate "_end" name, weak attribute |
| 995 | * makes &_end == NULL, end_len == 0 here.) |
| 996 | */ |
| 997 | extern char _end[] __attribute__((weak)); |
| 998 | unsigned end_len = (-(int)_end) & 0xfff; |
| 999 | printf("_end:%p %u bytes\n", &_end, end_len); |
| 1000 | #endif |
| 1001 | |
Denys Vlasenko | 1f7c167 | 2009-09-06 02:12:28 +0200 | [diff] [blame] | 1002 | /* Tweak malloc for reduced memory consumption */ |
Denys Vlasenko | 1f7c167 | 2009-09-06 02:12:28 +0200 | [diff] [blame] | 1003 | #ifdef M_TRIM_THRESHOLD |
| 1004 | /* M_TRIM_THRESHOLD is the maximum amount of freed top-most memory |
| 1005 | * to keep before releasing to the OS |
| 1006 | * Default is way too big: 256k |
| 1007 | */ |
Denys Vlasenko | fe86d6b | 2011-06-03 21:39:42 +0200 | [diff] [blame] | 1008 | mallopt(M_TRIM_THRESHOLD, 8 * 1024); |
Denys Vlasenko | 1f7c167 | 2009-09-06 02:12:28 +0200 | [diff] [blame] | 1009 | #endif |
| 1010 | #ifdef M_MMAP_THRESHOLD |
| 1011 | /* M_MMAP_THRESHOLD is the request size threshold for using mmap() |
| 1012 | * Default is too big: 256k |
| 1013 | */ |
Denys Vlasenko | fe86d6b | 2011-06-03 21:39:42 +0200 | [diff] [blame] | 1014 | mallopt(M_MMAP_THRESHOLD, 32 * 1024 - 256); |
Denys Vlasenko | 1f7c167 | 2009-09-06 02:12:28 +0200 | [diff] [blame] | 1015 | #endif |
Denys Vlasenko | 7f0ebbc | 2016-10-03 17:42:53 +0200 | [diff] [blame] | 1016 | #if 0 /*def M_TOP_PAD*/ |
| 1017 | /* When the program break is increased, then M_TOP_PAD bytes are added |
| 1018 | * to the sbrk(2) request. When the heap is trimmed because of free(3), |
| 1019 | * this much free space is preserved at the top of the heap. |
| 1020 | * glibc default seems to be way too big: 128k, but need to verify. |
| 1021 | */ |
| 1022 | mallopt(M_TOP_PAD, 8 * 1024); |
| 1023 | #endif |
Denys Vlasenko | 1f7c167 | 2009-09-06 02:12:28 +0200 | [diff] [blame] | 1024 | |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 1025 | #if !BB_MMU |
| 1026 | /* NOMMU re-exec trick sets high-order bit in first byte of name */ |
| 1027 | if (argv[0][0] & 0x80) { |
| 1028 | re_execed = 1; |
| 1029 | argv[0][0] &= 0x7f; |
| 1030 | } |
| 1031 | #endif |
Denys Vlasenko | 8f0af3b | 2010-11-29 02:55:35 +0100 | [diff] [blame] | 1032 | |
| 1033 | #if defined(SINGLE_APPLET_MAIN) |
Denys Vlasenko | 7e8218f | 2016-11-18 21:42:44 +0100 | [diff] [blame] | 1034 | |
Denys Vlasenko | 8f0af3b | 2010-11-29 02:55:35 +0100 | [diff] [blame] | 1035 | /* Only one applet is selected in .config */ |
Denys Vlasenko | 8dff01d | 2015-03-12 17:48:34 +0100 | [diff] [blame] | 1036 | if (argv[1] && is_prefixed_with(argv[0], "busybox")) { |
Denys Vlasenko | 8f0af3b | 2010-11-29 02:55:35 +0100 | [diff] [blame] | 1037 | /* "busybox <applet> <params>" should still work as expected */ |
| 1038 | argv++; |
| 1039 | } |
| 1040 | /* applet_names in this case is just "applet\0\0" */ |
| 1041 | lbb_prepare(applet_names IF_FEATURE_INDIVIDUAL(, argv)); |
Denys Vlasenko | d4e4fdb | 2017-07-03 21:31:16 +0200 | [diff] [blame] | 1042 | # if ENABLE_BUILD_LIBBUSYBOX |
| 1043 | return SINGLE_APPLET_MAIN(string_array_len(argv), argv); |
| 1044 | # else |
Denys Vlasenko | 8f0af3b | 2010-11-29 02:55:35 +0100 | [diff] [blame] | 1045 | return SINGLE_APPLET_MAIN(argc, argv); |
Denys Vlasenko | d4e4fdb | 2017-07-03 21:31:16 +0200 | [diff] [blame] | 1046 | # endif |
Denys Vlasenko | 8f0af3b | 2010-11-29 02:55:35 +0100 | [diff] [blame] | 1047 | |
Denys Vlasenko | 7e8218f | 2016-11-18 21:42:44 +0100 | [diff] [blame] | 1048 | #elif !ENABLE_BUSYBOX && NUM_APPLETS == 0 |
| 1049 | |
| 1050 | full_write2_str(bb_basename(argv[0])); |
| 1051 | full_write2_str(": no applets enabled\n"); |
| 1052 | exit(127); |
| 1053 | |
| 1054 | #else |
| 1055 | |
| 1056 | lbb_prepare("busybox" IF_FEATURE_INDIVIDUAL(, argv)); |
Denys Vlasenko | f4f8fe8 | 2016-07-05 21:43:28 +0200 | [diff] [blame] | 1057 | # if !ENABLE_BUSYBOX |
Ron Yorston | ba12081 | 2016-06-07 10:26:24 +0100 | [diff] [blame] | 1058 | if (argv[1] && is_prefixed_with(bb_basename(argv[0]), "busybox")) |
| 1059 | argv++; |
Denys Vlasenko | f4f8fe8 | 2016-07-05 21:43:28 +0200 | [diff] [blame] | 1060 | # endif |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 1061 | applet_name = argv[0]; |
| 1062 | if (applet_name[0] == '-') |
| 1063 | applet_name++; |
| 1064 | applet_name = bb_basename(applet_name); |
Denys Vlasenko | 147d2ce | 2017-07-29 02:19:01 +0200 | [diff] [blame] | 1065 | |
Denys Vlasenko | 147d2ce | 2017-07-29 02:19:01 +0200 | [diff] [blame] | 1066 | /* If we are a result of execv("/proc/self/exe"), fix ugly comm of "exe" */ |
| 1067 | if (ENABLE_FEATURE_SH_STANDALONE |
| 1068 | || ENABLE_FEATURE_PREFER_APPLETS |
| 1069 | || !BB_MMU |
| 1070 | ) { |
Denys Vlasenko | f2cf1cc | 2017-08-07 18:45:33 +0200 | [diff] [blame] | 1071 | if (NUM_APPLETS > 1) |
| 1072 | set_task_comm(applet_name); |
Denys Vlasenko | 147d2ce | 2017-07-29 02:19:01 +0200 | [diff] [blame] | 1073 | } |
Denys Vlasenko | 147d2ce | 2017-07-29 02:19:01 +0200 | [diff] [blame] | 1074 | |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 1075 | parse_config_file(); /* ...maybe, if FEATURE_SUID_CONFIG */ |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 1076 | run_applet_and_exit(applet_name, argv); |
Denys Vlasenko | 7e8218f | 2016-11-18 21:42:44 +0100 | [diff] [blame] | 1077 | |
Denis Vlasenko | 468aea2 | 2008-04-01 14:47:57 +0000 | [diff] [blame] | 1078 | #endif |
Denis Vlasenko | 724d196 | 2007-10-10 14:41:07 +0000 | [diff] [blame] | 1079 | } |