[2725] | 1 | /* vi: set sw=4 ts=4: */
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| 2 | /*
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| 3 | * Utility routines.
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| 4 | *
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| 5 | * Copyright (C) tons of folks. Tracking down who wrote what
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| 6 | * isn't something I'm going to worry about... If you wrote something
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| 7 | * here, please feel free to acknowledge your work.
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| 8 | *
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| 9 | * Based in part on code from sash, Copyright (c) 1999 by David I. Bell
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| 10 | * Permission has been granted to redistribute this code under GPL.
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| 11 | *
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| 12 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
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| 13 | */
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| 14 |
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| 15 | /* We are trying to not use printf, this benefits the case when selected
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| 16 | * applets are really simple. Example:
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| 17 | *
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| 18 | * $ ./busybox
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| 19 | * ...
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| 20 | * Currently defined functions:
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| 21 | * basename, false, true
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| 22 | *
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| 23 | * $ size busybox
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| 24 | * text data bss dec hex filename
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| 25 | * 4473 52 72 4597 11f5 busybox
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| 26 | *
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| 27 | * FEATURE_INSTALLER or FEATURE_SUID will still link printf routines in. :(
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| 28 | */
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| 29 | #include "busybox.h"
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[3232] | 30 |
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| 31 | #if !(defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__NetBSD__) \
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[3621] | 32 | || defined(__APPLE__) \
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[3232] | 33 | )
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| 34 | # include <malloc.h> /* for mallopt */
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[2725] | 35 | #endif
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| 36 |
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| 37 |
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| 38 | /* Declare <applet>_main() */
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| 39 | #define PROTOTYPES
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| 40 | #include "applets.h"
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| 41 | #undef PROTOTYPES
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| 42 |
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| 43 | /* Include generated applet names, pointers to <applet>_main, etc */
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| 44 | #include "applet_tables.h"
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| 45 | /* ...and if applet_tables generator says we have only one applet... */
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| 46 | #ifdef SINGLE_APPLET_MAIN
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| 47 | # undef ENABLE_FEATURE_INDIVIDUAL
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| 48 | # define ENABLE_FEATURE_INDIVIDUAL 1
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| 49 | # undef IF_FEATURE_INDIVIDUAL
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| 50 | # define IF_FEATURE_INDIVIDUAL(...) __VA_ARGS__
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| 51 | #endif
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| 52 |
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| 53 | #include "usage_compressed.h"
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| 54 |
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[3621] | 55 | static void run_applet_and_exit(const char *name, char **argv) NORETURN;
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[3232] | 56 |
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[2725] | 57 | #if ENABLE_SHOW_USAGE && !ENABLE_FEATURE_COMPRESS_USAGE
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| 58 | static const char usage_messages[] ALIGN1 = UNPACKED_USAGE;
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| 59 | #else
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| 60 | # define usage_messages 0
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| 61 | #endif
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| 62 |
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| 63 | #if ENABLE_FEATURE_COMPRESS_USAGE
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| 64 |
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| 65 | static const char packed_usage[] ALIGN1 = { PACKED_USAGE };
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[3232] | 66 | # include "bb_archive.h"
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[2725] | 67 | static const char *unpack_usage_messages(void)
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| 68 | {
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| 69 | char *outbuf = NULL;
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| 70 | bunzip_data *bd;
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| 71 | int i;
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| 72 |
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| 73 | i = start_bunzip(&bd,
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| 74 | /* src_fd: */ -1,
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| 75 | /* inbuf: */ packed_usage,
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| 76 | /* len: */ sizeof(packed_usage));
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| 77 | /* read_bunzip can longjmp to start_bunzip, and ultimately
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| 78 | * end up here with i != 0 on read data errors! Not trivial */
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| 79 | if (!i) {
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| 80 | /* Cannot use xmalloc: will leak bd in NOFORK case! */
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| 81 | outbuf = malloc_or_warn(sizeof(UNPACKED_USAGE));
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| 82 | if (outbuf)
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| 83 | read_bunzip(bd, outbuf, sizeof(UNPACKED_USAGE));
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| 84 | }
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| 85 | dealloc_bunzip(bd);
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| 86 | return outbuf;
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| 87 | }
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| 88 | # define dealloc_usage_messages(s) free(s)
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| 89 |
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| 90 | #else
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| 91 |
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| 92 | # define unpack_usage_messages() usage_messages
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| 93 | # define dealloc_usage_messages(s) ((void)(s))
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| 94 |
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| 95 | #endif /* FEATURE_COMPRESS_USAGE */
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| 96 |
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| 97 |
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| 98 | void FAST_FUNC bb_show_usage(void)
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| 99 | {
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| 100 | if (ENABLE_SHOW_USAGE) {
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| 101 | #ifdef SINGLE_APPLET_STR
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| 102 | /* Imagine that this applet is "true". Dont suck in printf! */
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| 103 | const char *usage_string = unpack_usage_messages();
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| 104 |
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| 105 | if (*usage_string == '\b') {
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| 106 | full_write2_str("No help available.\n\n");
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| 107 | } else {
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| 108 | full_write2_str("Usage: "SINGLE_APPLET_STR" ");
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| 109 | full_write2_str(usage_string);
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| 110 | full_write2_str("\n\n");
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| 111 | }
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| 112 | if (ENABLE_FEATURE_CLEAN_UP)
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| 113 | dealloc_usage_messages((char*)usage_string);
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| 114 | #else
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| 115 | const char *p;
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| 116 | const char *usage_string = p = unpack_usage_messages();
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| 117 | int ap = find_applet_by_name(applet_name);
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| 118 |
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| 119 | if (ap < 0) /* never happens, paranoia */
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| 120 | xfunc_die();
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| 121 | while (ap) {
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| 122 | while (*p++) continue;
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| 123 | ap--;
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| 124 | }
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| 125 | full_write2_str(bb_banner);
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| 126 | full_write2_str(" multi-call binary.\n");
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| 127 | if (*p == '\b')
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| 128 | full_write2_str("\nNo help available.\n\n");
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| 129 | else {
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| 130 | full_write2_str("\nUsage: ");
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| 131 | full_write2_str(applet_name);
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| 132 | full_write2_str(" ");
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| 133 | full_write2_str(p);
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[3621] | 134 | full_write2_str("\n");
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[2725] | 135 | }
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| 136 | if (ENABLE_FEATURE_CLEAN_UP)
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| 137 | dealloc_usage_messages((char*)usage_string);
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| 138 | #endif
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| 139 | }
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| 140 | xfunc_die();
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| 141 | }
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| 142 |
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| 143 | int FAST_FUNC find_applet_by_name(const char *name)
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| 144 | {
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[3621] | 145 | unsigned i, max;
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| 146 | int j;
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[2725] | 147 | const char *p;
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[3621] | 148 |
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| 149 | /* The commented-out word-at-a-time code is ~40% faster, but +160 bytes.
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| 150 | * "Faster" here saves ~0.5 microsecond of real time - not worth it.
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| 151 | */
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| 152 | #if 0 /*BB_UNALIGNED_MEMACCESS_OK && BB_LITTLE_ENDIAN*/
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| 153 | uint32_t n32;
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| 154 |
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| 155 | /* Handle all names < 2 chars long early */
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| 156 | if (name[0] == '\0')
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| 157 | return -1; /* "" is not a valid applet name */
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| 158 | if (name[1] == '\0') {
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| 159 | if (!ENABLE_TEST)
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| 160 | return -1; /* 1-char name is not valid */
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| 161 | if (name[0] != ']')
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| 162 | return -1; /* 1-char name which isn't "[" is not valid */
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| 163 | /* applet "[" is always applet #0: */
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| 164 | return 0;
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| 165 | }
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| 166 | #endif
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| 167 |
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| 168 | p = applet_names;
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| 169 | i = 0;
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| 170 | #if KNOWN_APPNAME_OFFSETS <= 0
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| 171 | max = NUM_APPLETS;
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[2725] | 172 | #else
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[3621] | 173 | max = NUM_APPLETS * KNOWN_APPNAME_OFFSETS;
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| 174 | for (j = ARRAY_SIZE(applet_nameofs)-1; j >= 0; j--) {
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| 175 | const char *pp = applet_names + applet_nameofs[j];
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| 176 | if (strcmp(name, pp) >= 0) {
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| 177 | //bb_error_msg("name:'%s' >= pp:'%s'", name, pp);
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| 178 | p = pp;
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| 179 | i = max - NUM_APPLETS;
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| 180 | break;
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| 181 | }
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| 182 | max -= NUM_APPLETS;
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| 183 | }
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| 184 | max /= (unsigned)KNOWN_APPNAME_OFFSETS;
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| 185 | i /= (unsigned)KNOWN_APPNAME_OFFSETS;
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| 186 | //bb_error_msg("name:'%s' starting from:'%s' i:%u max:%u", name, p, i, max);
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| 187 | #endif
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| 188 |
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| 189 | /* Open-coded linear search without strcmp/strlen calls for speed */
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| 190 |
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| 191 | #if 0 /*BB_UNALIGNED_MEMACCESS_OK && BB_LITTLE_ENDIAN*/
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| 192 | /* skip "[\0" name, it's surely not it */
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| 193 | if (ENABLE_TEST && LONE_CHAR(p, '['))
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| 194 | i++, p += 2;
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| 195 | /* All remaining applet names in p[] are at least 2 chars long */
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| 196 | /* name[] is also at least 2 chars long */
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| 197 |
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| 198 | n32 = (name[0] << 0) | (name[1] << 8) | (name[2] << 16);
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| 199 | while (i < max) {
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| 200 | uint32_t p32;
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| 201 | char ch;
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| 202 |
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| 203 | /* Quickly check match of the first 3 bytes */
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| 204 | move_from_unaligned32(p32, p);
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| 205 | p += 3;
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| 206 | if ((p32 & 0x00ffffff) != n32) {
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| 207 | /* Most likely case: 3 first bytes do not match */
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| 208 | i++;
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| 209 | if ((p32 & 0x00ff0000) == '\0')
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| 210 | continue; // p[2] was NUL
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| 211 | p++;
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| 212 | if ((p32 & 0xff000000) == '\0')
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| 213 | continue; // p[3] was NUL
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| 214 | /* p[0..3] aren't matching and none is NUL, check the rest */
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| 215 | while (*p++ != '\0')
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| 216 | continue;
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| 217 | continue;
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| 218 | }
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| 219 |
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| 220 | /* Unlikely branch: first 3 bytes ([0..2]) match */
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| 221 | if ((p32 & 0x00ff0000) == '\0') {
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| 222 | /* name is 2-byte long, it is full match */
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| 223 | //bb_error_msg("found:'%s' i:%u", name, i);
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[2725] | 224 | return i;
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[3621] | 225 | }
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| 226 | /* Check remaining bytes [3..NUL] */
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| 227 | ch = (p32 >> 24);
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| 228 | j = 3;
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| 229 | while (ch == name[j]) {
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| 230 | if (ch == '\0') {
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| 231 | //bb_error_msg("found:'%s' i:%u", name, i);
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| 232 | return i;
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| 233 | }
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| 234 | ch = *++p;
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| 235 | j++;
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| 236 | }
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| 237 | /* Not a match. Skip it, including NUL */
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| 238 | while (ch != '\0')
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| 239 | ch = *++p;
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| 240 | p++;
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[2725] | 241 | i++;
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| 242 | }
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| 243 | return -1;
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[3621] | 244 | #else
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| 245 | while (i < max) {
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| 246 | char ch;
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| 247 | j = 0;
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| 248 | /* Do we see "name\0" in applet_names[p] position? */
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| 249 | while ((ch = *p) == name[j]) {
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| 250 | if (ch == '\0') {
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| 251 | //bb_error_msg("found:'%s' i:%u", name, i);
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| 252 | return i; /* yes */
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| 253 | }
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| 254 | p++;
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| 255 | j++;
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| 256 | }
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| 257 | /* No.
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| 258 | * p => 1st non-matching char in applet_names[],
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| 259 | * skip to and including NUL.
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| 260 | */
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| 261 | while (ch != '\0')
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| 262 | ch = *++p;
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| 263 | p++;
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| 264 | i++;
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| 265 | }
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| 266 | return -1;
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[2725] | 267 | #endif
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| 268 | }
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| 269 |
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| 270 |
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| 271 | void lbb_prepare(const char *applet
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| 272 | IF_FEATURE_INDIVIDUAL(, char **argv))
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| 273 | MAIN_EXTERNALLY_VISIBLE;
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| 274 | void lbb_prepare(const char *applet
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| 275 | IF_FEATURE_INDIVIDUAL(, char **argv))
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| 276 | {
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| 277 | #ifdef __GLIBC__
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| 278 | (*(int **)&bb_errno) = __errno_location();
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| 279 | barrier();
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| 280 | #endif
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| 281 | applet_name = applet;
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| 282 |
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[3621] | 283 | if (ENABLE_LOCALE_SUPPORT)
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[2725] | 284 | setlocale(LC_ALL, "");
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| 285 |
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| 286 | #if ENABLE_FEATURE_INDIVIDUAL
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| 287 | /* Redundant for busybox (run_applet_and_exit covers that case)
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| 288 | * but needed for "individual applet" mode */
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| 289 | if (argv[1]
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| 290 | && !argv[2]
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| 291 | && strcmp(argv[1], "--help") == 0
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[3621] | 292 | && !is_prefixed_with(applet, "busybox")
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[2725] | 293 | ) {
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| 294 | /* Special case. POSIX says "test --help"
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| 295 | * should be no different from e.g. "test --foo". */
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| 296 | if (!ENABLE_TEST || strcmp(applet_name, "test") != 0)
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| 297 | bb_show_usage();
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| 298 | }
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| 299 | #endif
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| 300 | }
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| 301 |
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| 302 | /* The code below can well be in applets/applets.c, as it is used only
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| 303 | * for busybox binary, not "individual" binaries.
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| 304 | * However, keeping it here and linking it into libbusybox.so
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| 305 | * (together with remaining tiny applets/applets.o)
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| 306 | * makes it possible to avoid --whole-archive at link time.
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| 307 | * This makes (shared busybox) + libbusybox smaller.
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| 308 | * (--gc-sections would be even better....)
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| 309 | */
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| 310 |
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| 311 | const char *applet_name;
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| 312 | #if !BB_MMU
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| 313 | bool re_execed;
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| 314 | #endif
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| 315 |
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| 316 |
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| 317 | /* If not built as a single-applet executable... */
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| 318 | #if !defined(SINGLE_APPLET_MAIN)
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| 319 |
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| 320 | IF_FEATURE_SUID(static uid_t ruid;) /* real uid */
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| 321 |
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[3232] | 322 | # if ENABLE_FEATURE_SUID_CONFIG
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[2725] | 323 |
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[3232] | 324 | static struct suid_config_t {
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| 325 | /* next ptr must be first: this struct needs to be llist-compatible */
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| 326 | struct suid_config_t *m_next;
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| 327 | struct bb_uidgid_t m_ugid;
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[2725] | 328 | int m_applet;
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| 329 | mode_t m_mode;
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| 330 | } *suid_config;
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| 331 |
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| 332 | static bool suid_cfg_readable;
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| 333 |
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| 334 | /* check if u is member of group g */
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| 335 | static int ingroup(uid_t u, gid_t g)
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| 336 | {
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| 337 | struct group *grp = getgrgid(g);
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| 338 | if (grp) {
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| 339 | char **mem;
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| 340 | for (mem = grp->gr_mem; *mem; mem++) {
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| 341 | struct passwd *pwd = getpwnam(*mem);
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| 342 | if (pwd && (pwd->pw_uid == u))
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| 343 | return 1;
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| 344 | }
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| 345 | }
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| 346 | return 0;
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| 347 | }
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| 348 |
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[3232] | 349 | /* libbb candidate */
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[2725] | 350 | static char *get_trimmed_slice(char *s, char *e)
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| 351 | {
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| 352 | /* First, consider the value at e to be nul and back up until we
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| 353 | * reach a non-space char. Set the char after that (possibly at
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| 354 | * the original e) to nul. */
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| 355 | while (e-- > s) {
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| 356 | if (!isspace(*e)) {
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| 357 | break;
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| 358 | }
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| 359 | }
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| 360 | e[1] = '\0';
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| 361 |
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| 362 | /* Next, advance past all leading space and return a ptr to the
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| 363 | * first non-space char; possibly the terminating nul. */
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| 364 | return skip_whitespace(s);
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| 365 | }
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| 366 |
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| 367 | static void parse_config_file(void)
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| 368 | {
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[3232] | 369 | /* Don't depend on the tools to combine strings. */
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| 370 | static const char config_file[] ALIGN1 = "/etc/busybox.conf";
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| 371 |
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| 372 | struct suid_config_t *sct_head;
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[2725] | 373 | int applet_no;
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| 374 | FILE *f;
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| 375 | const char *errmsg;
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| 376 | unsigned lc;
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| 377 | smallint section;
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| 378 | struct stat st;
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| 379 |
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| 380 | ruid = getuid();
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| 381 | if (ruid == 0) /* run by root - don't need to even read config file */
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| 382 | return;
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| 383 |
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| 384 | if ((stat(config_file, &st) != 0) /* No config file? */
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| 385 | || !S_ISREG(st.st_mode) /* Not a regular file? */
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| 386 | || (st.st_uid != 0) /* Not owned by root? */
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| 387 | || (st.st_mode & (S_IWGRP | S_IWOTH)) /* Writable by non-root? */
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[3232] | 388 | || !(f = fopen_for_read(config_file)) /* Cannot open? */
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[2725] | 389 | ) {
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| 390 | return;
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| 391 | }
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| 392 |
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| 393 | suid_cfg_readable = 1;
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| 394 | sct_head = NULL;
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| 395 | section = lc = 0;
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| 396 |
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| 397 | while (1) {
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[3232] | 398 | char buffer[256];
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| 399 | char *s;
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[2725] | 400 |
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[3232] | 401 | if (!fgets(buffer, sizeof(buffer), f)) { /* Are we done? */
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| 402 | // Looks like bloat
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| 403 | //if (ferror(f)) { /* Make sure it wasn't a read error. */
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| 404 | // errmsg = "reading";
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| 405 | // goto pe_label;
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| 406 | //}
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[2725] | 407 | fclose(f);
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| 408 | suid_config = sct_head; /* Success, so set the pointer. */
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| 409 | return;
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| 410 | }
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| 411 |
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[3232] | 412 | s = buffer;
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[2725] | 413 | lc++; /* Got a (partial) line. */
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| 414 |
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| 415 | /* If a line is too long for our buffer, we consider it an error.
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| 416 | * The following test does mistreat one corner case though.
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| 417 | * If the final line of the file does not end with a newline and
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| 418 | * yet exactly fills the buffer, it will be treated as too long
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| 419 | * even though there isn't really a problem. But it isn't really
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| 420 | * worth adding code to deal with such an unlikely situation, and
|
---|
| 421 | * we do err on the side of caution. Besides, the line would be
|
---|
| 422 | * too long if it did end with a newline. */
|
---|
| 423 | if (!strchr(s, '\n') && !feof(f)) {
|
---|
[3232] | 424 | errmsg = "line too long";
|
---|
| 425 | goto pe_label;
|
---|
[2725] | 426 | }
|
---|
| 427 |
|
---|
| 428 | /* Trim leading and trailing whitespace, ignoring comments, and
|
---|
| 429 | * check if the resulting string is empty. */
|
---|
| 430 | s = get_trimmed_slice(s, strchrnul(s, '#'));
|
---|
| 431 | if (!*s) {
|
---|
| 432 | continue;
|
---|
| 433 | }
|
---|
| 434 |
|
---|
| 435 | /* Check for a section header. */
|
---|
| 436 |
|
---|
| 437 | if (*s == '[') {
|
---|
| 438 | /* Unlike the old code, we ignore leading and trailing
|
---|
| 439 | * whitespace for the section name. We also require that
|
---|
| 440 | * there are no stray characters after the closing bracket. */
|
---|
[3232] | 441 | char *e = strchr(s, ']');
|
---|
[2725] | 442 | if (!e /* Missing right bracket? */
|
---|
| 443 | || e[1] /* Trailing characters? */
|
---|
| 444 | || !*(s = get_trimmed_slice(s+1, e)) /* Missing name? */
|
---|
| 445 | ) {
|
---|
[3232] | 446 | errmsg = "section header";
|
---|
| 447 | goto pe_label;
|
---|
[2725] | 448 | }
|
---|
| 449 | /* Right now we only have one section so just check it.
|
---|
| 450 | * If more sections are added in the future, please don't
|
---|
| 451 | * resort to cascading ifs with multiple strcasecmp calls.
|
---|
| 452 | * That kind of bloated code is all too common. A loop
|
---|
| 453 | * and a string table would be a better choice unless the
|
---|
| 454 | * number of sections is very small. */
|
---|
| 455 | if (strcasecmp(s, "SUID") == 0) {
|
---|
| 456 | section = 1;
|
---|
| 457 | continue;
|
---|
| 458 | }
|
---|
| 459 | section = -1; /* Unknown section so set to skip. */
|
---|
| 460 | continue;
|
---|
| 461 | }
|
---|
| 462 |
|
---|
| 463 | /* Process sections. */
|
---|
| 464 |
|
---|
| 465 | if (section == 1) { /* SUID */
|
---|
| 466 | /* Since we trimmed leading and trailing space above, we're
|
---|
| 467 | * now looking for strings of the form
|
---|
| 468 | * <key>[::space::]*=[::space::]*<value>
|
---|
| 469 | * where both key and value could contain inner whitespace. */
|
---|
| 470 |
|
---|
| 471 | /* First get the key (an applet name in our case). */
|
---|
[3232] | 472 | char *e = strchr(s, '=');
|
---|
[2725] | 473 | if (e) {
|
---|
| 474 | s = get_trimmed_slice(s, e);
|
---|
| 475 | }
|
---|
| 476 | if (!e || !*s) { /* Missing '=' or empty key. */
|
---|
[3232] | 477 | errmsg = "keyword";
|
---|
| 478 | goto pe_label;
|
---|
[2725] | 479 | }
|
---|
| 480 |
|
---|
| 481 | /* Ok, we have an applet name. Process the rhs if this
|
---|
| 482 | * applet is currently built in and ignore it otherwise.
|
---|
| 483 | * Note: this can hide config file bugs which only pop
|
---|
| 484 | * up when the busybox configuration is changed. */
|
---|
| 485 | applet_no = find_applet_by_name(s);
|
---|
| 486 | if (applet_no >= 0) {
|
---|
[3232] | 487 | unsigned i;
|
---|
| 488 | struct suid_config_t *sct;
|
---|
| 489 |
|
---|
[2725] | 490 | /* Note: We currently don't check for duplicates!
|
---|
| 491 | * The last config line for each applet will be the
|
---|
| 492 | * one used since we insert at the head of the list.
|
---|
| 493 | * I suppose this could be considered a feature. */
|
---|
[3232] | 494 | sct = xzalloc(sizeof(*sct));
|
---|
[2725] | 495 | sct->m_applet = applet_no;
|
---|
[3232] | 496 | /*sct->m_mode = 0;*/
|
---|
[2725] | 497 | sct->m_next = sct_head;
|
---|
| 498 | sct_head = sct;
|
---|
| 499 |
|
---|
| 500 | /* Get the specified mode. */
|
---|
| 501 |
|
---|
| 502 | e = skip_whitespace(e+1);
|
---|
| 503 |
|
---|
| 504 | for (i = 0; i < 3; i++) {
|
---|
[3232] | 505 | /* There are 4 chars for each of user/group/other.
|
---|
| 506 | * "x-xx" instead of "x-" are to make
|
---|
| 507 | * "idx > 3" check catch invalid chars.
|
---|
| 508 | */
|
---|
| 509 | static const char mode_chars[] ALIGN1 = "Ssx-" "Ssx-" "x-xx";
|
---|
| 510 | static const unsigned short mode_mask[] ALIGN2 = {
|
---|
| 511 | S_ISUID, S_ISUID|S_IXUSR, S_IXUSR, 0, /* Ssx- */
|
---|
| 512 | S_ISGID, S_ISGID|S_IXGRP, S_IXGRP, 0, /* Ssx- */
|
---|
| 513 | S_IXOTH, 0 /* x- */
|
---|
| 514 | };
|
---|
| 515 | const char *q = strchrnul(mode_chars + 4*i, *e);
|
---|
| 516 | unsigned idx = q - (mode_chars + 4*i);
|
---|
| 517 | if (idx > 3) {
|
---|
| 518 | errmsg = "mode";
|
---|
| 519 | goto pe_label;
|
---|
[2725] | 520 | }
|
---|
[3232] | 521 | sct->m_mode |= mode_mask[q - mode_chars];
|
---|
| 522 | e++;
|
---|
[2725] | 523 | }
|
---|
| 524 |
|
---|
[3232] | 525 | /* Now get the user/group info. */
|
---|
[2725] | 526 |
|
---|
| 527 | s = skip_whitespace(e);
|
---|
[3232] | 528 | /* Default is 0.0, else parse USER.GROUP: */
|
---|
| 529 | if (*s) {
|
---|
| 530 | /* We require whitespace between mode and USER.GROUP */
|
---|
| 531 | if ((s == e) || !(e = strchr(s, '.'))) {
|
---|
| 532 | errmsg = "uid.gid";
|
---|
| 533 | goto pe_label;
|
---|
[2725] | 534 | }
|
---|
[3232] | 535 | *e = ':'; /* get_uidgid needs USER:GROUP syntax */
|
---|
[3621] | 536 | if (get_uidgid(&sct->m_ugid, s) == 0) {
|
---|
[3232] | 537 | errmsg = "unknown user/group";
|
---|
| 538 | goto pe_label;
|
---|
[2725] | 539 | }
|
---|
| 540 | }
|
---|
| 541 | }
|
---|
| 542 | continue;
|
---|
| 543 | }
|
---|
| 544 |
|
---|
| 545 | /* Unknown sections are ignored. */
|
---|
| 546 |
|
---|
| 547 | /* Encountering configuration lines prior to seeing a
|
---|
| 548 | * section header is treated as an error. This is how
|
---|
| 549 | * the old code worked, but it may not be desirable.
|
---|
| 550 | * We may want to simply ignore such lines in case they
|
---|
| 551 | * are used in some future version of busybox. */
|
---|
| 552 | if (!section) {
|
---|
[3232] | 553 | errmsg = "keyword outside section";
|
---|
| 554 | goto pe_label;
|
---|
[2725] | 555 | }
|
---|
| 556 | } /* while (1) */
|
---|
| 557 |
|
---|
| 558 | pe_label:
|
---|
[3232] | 559 | fclose(f);
|
---|
| 560 | bb_error_msg("parse error in %s, line %u: %s", config_file, lc, errmsg);
|
---|
[2725] | 561 |
|
---|
| 562 | /* Release any allocated memory before returning. */
|
---|
[3232] | 563 | llist_free((llist_t*)sct_head, NULL);
|
---|
[2725] | 564 | }
|
---|
[3232] | 565 | # else
|
---|
[2725] | 566 | static inline void parse_config_file(void)
|
---|
| 567 | {
|
---|
| 568 | IF_FEATURE_SUID(ruid = getuid();)
|
---|
| 569 | }
|
---|
[3232] | 570 | # endif /* FEATURE_SUID_CONFIG */
|
---|
[2725] | 571 |
|
---|
| 572 |
|
---|
[3232] | 573 | # if ENABLE_FEATURE_SUID
|
---|
[2725] | 574 | static void check_suid(int applet_no)
|
---|
| 575 | {
|
---|
| 576 | gid_t rgid; /* real gid */
|
---|
| 577 |
|
---|
| 578 | if (ruid == 0) /* set by parse_config_file() */
|
---|
| 579 | return; /* run by root - no need to check more */
|
---|
| 580 | rgid = getgid();
|
---|
| 581 |
|
---|
[3232] | 582 | # if ENABLE_FEATURE_SUID_CONFIG
|
---|
[2725] | 583 | if (suid_cfg_readable) {
|
---|
| 584 | uid_t uid;
|
---|
[3232] | 585 | struct suid_config_t *sct;
|
---|
[2725] | 586 | mode_t m;
|
---|
| 587 |
|
---|
| 588 | for (sct = suid_config; sct; sct = sct->m_next) {
|
---|
| 589 | if (sct->m_applet == applet_no)
|
---|
| 590 | goto found;
|
---|
| 591 | }
|
---|
| 592 | goto check_need_suid;
|
---|
| 593 | found:
|
---|
[3232] | 594 | /* Is this user allowed to run this applet? */
|
---|
[2725] | 595 | m = sct->m_mode;
|
---|
[3232] | 596 | if (sct->m_ugid.uid == ruid)
|
---|
[2725] | 597 | /* same uid */
|
---|
| 598 | m >>= 6;
|
---|
[3232] | 599 | else if ((sct->m_ugid.gid == rgid) || ingroup(ruid, sct->m_ugid.gid))
|
---|
[2725] | 600 | /* same group / in group */
|
---|
| 601 | m >>= 3;
|
---|
[3232] | 602 | if (!(m & S_IXOTH)) /* is x bit not set? */
|
---|
| 603 | bb_error_msg_and_die("you have no permission to run this applet");
|
---|
[2725] | 604 |
|
---|
[3232] | 605 | /* We set effective AND saved ids. If saved-id is not set
|
---|
| 606 | * like we do below, seteuid(0) can still later succeed! */
|
---|
[2725] | 607 |
|
---|
[3232] | 608 | /* Are we directed to change gid
|
---|
| 609 | * (APPLET = *s* USER.GROUP or APPLET = *S* USER.GROUP)?
|
---|
| 610 | */
|
---|
| 611 | if (sct->m_mode & S_ISGID)
|
---|
| 612 | rgid = sct->m_ugid.gid;
|
---|
| 613 | /* else: we will set egid = rgid, thus dropping sgid effect */
|
---|
[2725] | 614 | if (setresgid(-1, rgid, rgid))
|
---|
| 615 | bb_perror_msg_and_die("setresgid");
|
---|
| 616 |
|
---|
[3232] | 617 | /* Are we directed to change uid
|
---|
| 618 | * (APPLET = s** USER.GROUP or APPLET = S** USER.GROUP)?
|
---|
| 619 | */
|
---|
[2725] | 620 | uid = ruid;
|
---|
| 621 | if (sct->m_mode & S_ISUID)
|
---|
[3232] | 622 | uid = sct->m_ugid.uid;
|
---|
| 623 | /* else: we will set euid = ruid, thus dropping suid effect */
|
---|
[2725] | 624 | if (setresuid(-1, uid, uid))
|
---|
| 625 | bb_perror_msg_and_die("setresuid");
|
---|
[3232] | 626 |
|
---|
| 627 | goto ret;
|
---|
[2725] | 628 | }
|
---|
[3232] | 629 | # if !ENABLE_FEATURE_SUID_CONFIG_QUIET
|
---|
[2725] | 630 | {
|
---|
| 631 | static bool onetime = 0;
|
---|
| 632 |
|
---|
| 633 | if (!onetime) {
|
---|
| 634 | onetime = 1;
|
---|
[3232] | 635 | bb_error_msg("using fallback suid method");
|
---|
[2725] | 636 | }
|
---|
| 637 | }
|
---|
[3232] | 638 | # endif
|
---|
[2725] | 639 | check_need_suid:
|
---|
[3232] | 640 | # endif
|
---|
| 641 | if (APPLET_SUID(applet_no) == BB_SUID_REQUIRE) {
|
---|
[2725] | 642 | /* Real uid is not 0. If euid isn't 0 too, suid bit
|
---|
| 643 | * is most probably not set on our executable */
|
---|
| 644 | if (geteuid())
|
---|
| 645 | bb_error_msg_and_die("must be suid to work properly");
|
---|
[3232] | 646 | } else if (APPLET_SUID(applet_no) == BB_SUID_DROP) {
|
---|
[2725] | 647 | xsetgid(rgid); /* drop all privileges */
|
---|
| 648 | xsetuid(ruid);
|
---|
| 649 | }
|
---|
[3232] | 650 | # if ENABLE_FEATURE_SUID_CONFIG
|
---|
| 651 | ret: ;
|
---|
| 652 | llist_free((llist_t*)suid_config, NULL);
|
---|
| 653 | # endif
|
---|
[2725] | 654 | }
|
---|
[3232] | 655 | # else
|
---|
| 656 | # define check_suid(x) ((void)0)
|
---|
| 657 | # endif /* FEATURE_SUID */
|
---|
[2725] | 658 |
|
---|
| 659 |
|
---|
[3232] | 660 | # if ENABLE_FEATURE_INSTALLER
|
---|
[2725] | 661 | static const char usr_bin [] ALIGN1 = "/usr/bin/";
|
---|
| 662 | static const char usr_sbin[] ALIGN1 = "/usr/sbin/";
|
---|
| 663 | static const char *const install_dir[] = {
|
---|
| 664 | &usr_bin [8], /* "/" */
|
---|
| 665 | &usr_bin [4], /* "/bin/" */
|
---|
| 666 | &usr_sbin[4] /* "/sbin/" */
|
---|
[3232] | 667 | # if !ENABLE_INSTALL_NO_USR
|
---|
[2725] | 668 | ,usr_bin
|
---|
| 669 | ,usr_sbin
|
---|
[3232] | 670 | # endif
|
---|
[2725] | 671 | };
|
---|
| 672 |
|
---|
| 673 | /* create (sym)links for each applet */
|
---|
| 674 | static void install_links(const char *busybox, int use_symbolic_links,
|
---|
| 675 | char *custom_install_dir)
|
---|
| 676 | {
|
---|
| 677 | /* directory table
|
---|
| 678 | * this should be consistent w/ the enum,
|
---|
| 679 | * busybox.h::bb_install_loc_t, or else... */
|
---|
| 680 | int (*lf)(const char *, const char *);
|
---|
| 681 | char *fpc;
|
---|
[3621] | 682 | const char *appname = applet_names;
|
---|
[2725] | 683 | unsigned i;
|
---|
| 684 | int rc;
|
---|
| 685 |
|
---|
| 686 | lf = link;
|
---|
| 687 | if (use_symbolic_links)
|
---|
| 688 | lf = symlink;
|
---|
| 689 |
|
---|
| 690 | for (i = 0; i < ARRAY_SIZE(applet_main); i++) {
|
---|
| 691 | fpc = concat_path_file(
|
---|
| 692 | custom_install_dir ? custom_install_dir : install_dir[APPLET_INSTALL_LOC(i)],
|
---|
[3621] | 693 | appname);
|
---|
[2725] | 694 | // debug: bb_error_msg("%slinking %s to busybox",
|
---|
| 695 | // use_symbolic_links ? "sym" : "", fpc);
|
---|
| 696 | rc = lf(busybox, fpc);
|
---|
| 697 | if (rc != 0 && errno != EEXIST) {
|
---|
| 698 | bb_simple_perror_msg(fpc);
|
---|
| 699 | }
|
---|
| 700 | free(fpc);
|
---|
[3621] | 701 | while (*appname++ != '\0')
|
---|
| 702 | continue;
|
---|
[2725] | 703 | }
|
---|
| 704 | }
|
---|
[3621] | 705 | # elif ENABLE_BUSYBOX
|
---|
| 706 | static void install_links(const char *busybox UNUSED_PARAM,
|
---|
| 707 | int use_symbolic_links UNUSED_PARAM,
|
---|
| 708 | char *custom_install_dir UNUSED_PARAM)
|
---|
| 709 | {
|
---|
| 710 | }
|
---|
[3232] | 711 | # endif
|
---|
[2725] | 712 |
|
---|
[3621] | 713 | # if ENABLE_BUSYBOX
|
---|
[2725] | 714 | /* If we were called as "busybox..." */
|
---|
| 715 | static int busybox_main(char **argv)
|
---|
| 716 | {
|
---|
| 717 | if (!argv[1]) {
|
---|
| 718 | /* Called without arguments */
|
---|
| 719 | const char *a;
|
---|
| 720 | int col;
|
---|
| 721 | unsigned output_width;
|
---|
| 722 | help:
|
---|
| 723 | output_width = 80;
|
---|
| 724 | if (ENABLE_FEATURE_AUTOWIDTH) {
|
---|
| 725 | /* Obtain the terminal width */
|
---|
[3621] | 726 | output_width = get_terminal_width(2);
|
---|
[2725] | 727 | }
|
---|
| 728 |
|
---|
| 729 | dup2(1, 2);
|
---|
| 730 | full_write2_str(bb_banner); /* reuse const string */
|
---|
| 731 | full_write2_str(" multi-call binary.\n"); /* reuse */
|
---|
| 732 | full_write2_str(
|
---|
[3621] | 733 | "BusyBox is copyrighted by many authors between 1998-2015.\n"
|
---|
[3232] | 734 | "Licensed under GPLv2. See source distribution for detailed\n"
|
---|
| 735 | "copyright notices.\n"
|
---|
[2725] | 736 | "\n"
|
---|
[3232] | 737 | "Usage: busybox [function [arguments]...]\n"
|
---|
| 738 | " or: busybox --list"IF_FEATURE_INSTALLER("[-full]")"\n"
|
---|
| 739 | IF_FEATURE_INSTALLER(
|
---|
| 740 | " or: busybox --install [-s] [DIR]\n"
|
---|
| 741 | )
|
---|
[2725] | 742 | " or: function [arguments]...\n"
|
---|
| 743 | "\n"
|
---|
[3621] | 744 | IF_NOT_FEATURE_SH_STANDALONE(
|
---|
[2725] | 745 | "\tBusyBox is a multi-call binary that combines many common Unix\n"
|
---|
| 746 | "\tutilities into a single executable. Most people will create a\n"
|
---|
| 747 | "\tlink to busybox for each function they wish to use and BusyBox\n"
|
---|
| 748 | "\twill act like whatever it was invoked as.\n"
|
---|
[3621] | 749 | )
|
---|
| 750 | IF_FEATURE_SH_STANDALONE(
|
---|
| 751 | "\tBusyBox is a multi-call binary that combines many common Unix\n"
|
---|
| 752 | "\tutilities into a single executable. The shell in this build\n"
|
---|
| 753 | "\tis configured to run built-in utilities without $PATH search.\n"
|
---|
| 754 | "\tYou don't need to install a link to busybox for each utility.\n"
|
---|
| 755 | "\tTo run external program, use full path (/sbin/ip instead of ip).\n"
|
---|
| 756 | )
|
---|
[2725] | 757 | "\n"
|
---|
| 758 | "Currently defined functions:\n"
|
---|
| 759 | );
|
---|
| 760 | col = 0;
|
---|
| 761 | a = applet_names;
|
---|
| 762 | /* prevent last comma to be in the very last pos */
|
---|
| 763 | output_width--;
|
---|
| 764 | while (*a) {
|
---|
| 765 | int len2 = strlen(a) + 2;
|
---|
| 766 | if (col >= (int)output_width - len2) {
|
---|
| 767 | full_write2_str(",\n");
|
---|
| 768 | col = 0;
|
---|
| 769 | }
|
---|
| 770 | if (col == 0) {
|
---|
| 771 | col = 6;
|
---|
| 772 | full_write2_str("\t");
|
---|
| 773 | } else {
|
---|
| 774 | full_write2_str(", ");
|
---|
| 775 | }
|
---|
| 776 | full_write2_str(a);
|
---|
| 777 | col += len2;
|
---|
| 778 | a += len2 - 1;
|
---|
| 779 | }
|
---|
| 780 | full_write2_str("\n\n");
|
---|
| 781 | return 0;
|
---|
| 782 | }
|
---|
| 783 |
|
---|
[3621] | 784 | if (is_prefixed_with(argv[1], "--list")) {
|
---|
[2725] | 785 | unsigned i = 0;
|
---|
| 786 | const char *a = applet_names;
|
---|
| 787 | dup2(1, 2);
|
---|
| 788 | while (*a) {
|
---|
[3621] | 789 | # if ENABLE_FEATURE_INSTALLER
|
---|
[3232] | 790 | if (argv[1][6]) /* --list-full? */
|
---|
[2725] | 791 | full_write2_str(install_dir[APPLET_INSTALL_LOC(i)] + 1);
|
---|
[3621] | 792 | # endif
|
---|
[2725] | 793 | full_write2_str(a);
|
---|
| 794 | full_write2_str("\n");
|
---|
| 795 | i++;
|
---|
[3621] | 796 | while (*a++ != '\0')
|
---|
| 797 | continue;
|
---|
[2725] | 798 | }
|
---|
| 799 | return 0;
|
---|
| 800 | }
|
---|
| 801 |
|
---|
| 802 | if (ENABLE_FEATURE_INSTALLER && strcmp(argv[1], "--install") == 0) {
|
---|
| 803 | int use_symbolic_links;
|
---|
| 804 | const char *busybox;
|
---|
[3232] | 805 |
|
---|
[2725] | 806 | busybox = xmalloc_readlink(bb_busybox_exec_path);
|
---|
[3232] | 807 | if (!busybox) {
|
---|
| 808 | /* bb_busybox_exec_path is usually "/proc/self/exe".
|
---|
| 809 | * In chroot, readlink("/proc/self/exe") usually fails.
|
---|
| 810 | * In such case, better use argv[0] as symlink target
|
---|
| 811 | * if it is a full path name.
|
---|
| 812 | */
|
---|
| 813 | if (argv[0][0] != '/')
|
---|
| 814 | bb_error_msg_and_die("'%s' is not an absolute path", argv[0]);
|
---|
| 815 | busybox = argv[0];
|
---|
| 816 | }
|
---|
| 817 | /* busybox --install [-s] [DIR]:
|
---|
| 818 | * -s: make symlinks
|
---|
| 819 | * DIR: directory to install links to
|
---|
| 820 | */
|
---|
| 821 | use_symbolic_links = (argv[2] && strcmp(argv[2], "-s") == 0 && ++argv);
|
---|
[2725] | 822 | install_links(busybox, use_symbolic_links, argv[2]);
|
---|
| 823 | return 0;
|
---|
| 824 | }
|
---|
| 825 |
|
---|
| 826 | if (strcmp(argv[1], "--help") == 0) {
|
---|
| 827 | /* "busybox --help [<applet>]" */
|
---|
| 828 | if (!argv[2])
|
---|
| 829 | goto help;
|
---|
| 830 | /* convert to "<applet> --help" */
|
---|
| 831 | argv[0] = argv[2];
|
---|
| 832 | argv[2] = NULL;
|
---|
| 833 | } else {
|
---|
| 834 | /* "busybox <applet> arg1 arg2 ..." */
|
---|
| 835 | argv++;
|
---|
| 836 | }
|
---|
| 837 | /* We support "busybox /a/path/to/applet args..." too. Allows for
|
---|
| 838 | * "#!/bin/busybox"-style wrappers */
|
---|
| 839 | applet_name = bb_get_last_path_component_nostrip(argv[0]);
|
---|
| 840 | run_applet_and_exit(applet_name, argv);
|
---|
| 841 | }
|
---|
[3621] | 842 | # endif
|
---|
[2725] | 843 |
|
---|
| 844 | void FAST_FUNC run_applet_no_and_exit(int applet_no, char **argv)
|
---|
| 845 | {
|
---|
| 846 | int argc = 1;
|
---|
| 847 |
|
---|
| 848 | while (argv[argc])
|
---|
| 849 | argc++;
|
---|
| 850 |
|
---|
| 851 | /* Reinit some shared global data */
|
---|
| 852 | xfunc_error_retval = EXIT_FAILURE;
|
---|
[3621] | 853 | applet_name = bb_get_last_path_component_nostrip(argv[0]);
|
---|
[2725] | 854 |
|
---|
[3621] | 855 | /* Special case. POSIX says "test --help"
|
---|
| 856 | * should be no different from e.g. "test --foo".
|
---|
| 857 | * Thus for "test", we skip --help check.
|
---|
| 858 | * "true" and "false" are also special.
|
---|
| 859 | */
|
---|
| 860 | if (1
|
---|
| 861 | #if defined APPLET_NO_test
|
---|
| 862 | && applet_no != APPLET_NO_test
|
---|
| 863 | #endif
|
---|
| 864 | #if defined APPLET_NO_true
|
---|
| 865 | && applet_no != APPLET_NO_true
|
---|
| 866 | #endif
|
---|
| 867 | #if defined APPLET_NO_false
|
---|
| 868 | && applet_no != APPLET_NO_false
|
---|
| 869 | #endif
|
---|
| 870 | ) {
|
---|
| 871 | if (argc == 2 && strcmp(argv[1], "--help") == 0) {
|
---|
| 872 | /* Make "foo --help" exit with 0: */
|
---|
| 873 | xfunc_error_retval = 0;
|
---|
[2725] | 874 | bb_show_usage();
|
---|
[3232] | 875 | }
|
---|
[2725] | 876 | }
|
---|
| 877 | if (ENABLE_FEATURE_SUID)
|
---|
| 878 | check_suid(applet_no);
|
---|
| 879 | exit(applet_main[applet_no](argc, argv));
|
---|
| 880 | }
|
---|
| 881 |
|
---|
[3621] | 882 | static NORETURN void run_applet_and_exit(const char *name, char **argv)
|
---|
[2725] | 883 | {
|
---|
[3621] | 884 | int applet;
|
---|
| 885 |
|
---|
| 886 | # if ENABLE_BUSYBOX
|
---|
| 887 | if (is_prefixed_with(name, "busybox"))
|
---|
| 888 | exit(busybox_main(argv));
|
---|
| 889 | # endif
|
---|
| 890 | /* find_applet_by_name() search is more expensive, so goes second */
|
---|
| 891 | applet = find_applet_by_name(name);
|
---|
[2725] | 892 | if (applet >= 0)
|
---|
| 893 | run_applet_no_and_exit(applet, argv);
|
---|
[3621] | 894 |
|
---|
| 895 | /*bb_error_msg_and_die("applet not found"); - links in printf */
|
---|
| 896 | full_write2_str(applet_name);
|
---|
| 897 | full_write2_str(": applet not found\n");
|
---|
| 898 | /* POSIX: "If a command is not found, the exit status shall be 127" */
|
---|
| 899 | exit(127);
|
---|
[2725] | 900 | }
|
---|
| 901 |
|
---|
| 902 | #endif /* !defined(SINGLE_APPLET_MAIN) */
|
---|
| 903 |
|
---|
| 904 |
|
---|
| 905 |
|
---|
| 906 | #if ENABLE_BUILD_LIBBUSYBOX
|
---|
| 907 | int lbb_main(char **argv)
|
---|
| 908 | #else
|
---|
| 909 | int main(int argc UNUSED_PARAM, char **argv)
|
---|
| 910 | #endif
|
---|
| 911 | {
|
---|
[3621] | 912 | #if 0
|
---|
| 913 | /* TODO: find a use for a block of memory between end of .bss
|
---|
| 914 | * and end of page. For example, I'm getting "_end:0x812e698 2408 bytes"
|
---|
| 915 | * - more than 2k of wasted memory (in this particular build)
|
---|
| 916 | * *per each running process*!
|
---|
| 917 | * (If your linker does not generate "_end" name, weak attribute
|
---|
| 918 | * makes &_end == NULL, end_len == 0 here.)
|
---|
| 919 | */
|
---|
| 920 | extern char _end[] __attribute__((weak));
|
---|
| 921 | unsigned end_len = (-(int)_end) & 0xfff;
|
---|
| 922 | printf("_end:%p %u bytes\n", &_end, end_len);
|
---|
| 923 | #endif
|
---|
| 924 |
|
---|
[2725] | 925 | /* Tweak malloc for reduced memory consumption */
|
---|
| 926 | #ifdef M_TRIM_THRESHOLD
|
---|
| 927 | /* M_TRIM_THRESHOLD is the maximum amount of freed top-most memory
|
---|
| 928 | * to keep before releasing to the OS
|
---|
| 929 | * Default is way too big: 256k
|
---|
| 930 | */
|
---|
[3232] | 931 | mallopt(M_TRIM_THRESHOLD, 8 * 1024);
|
---|
[2725] | 932 | #endif
|
---|
| 933 | #ifdef M_MMAP_THRESHOLD
|
---|
| 934 | /* M_MMAP_THRESHOLD is the request size threshold for using mmap()
|
---|
| 935 | * Default is too big: 256k
|
---|
| 936 | */
|
---|
[3232] | 937 | mallopt(M_MMAP_THRESHOLD, 32 * 1024 - 256);
|
---|
[2725] | 938 | #endif
|
---|
| 939 |
|
---|
[3232] | 940 | #if !BB_MMU
|
---|
| 941 | /* NOMMU re-exec trick sets high-order bit in first byte of name */
|
---|
| 942 | if (argv[0][0] & 0x80) {
|
---|
| 943 | re_execed = 1;
|
---|
| 944 | argv[0][0] &= 0x7f;
|
---|
| 945 | }
|
---|
| 946 | #endif
|
---|
| 947 |
|
---|
[2725] | 948 | #if defined(SINGLE_APPLET_MAIN)
|
---|
[3232] | 949 | /* Only one applet is selected in .config */
|
---|
[3621] | 950 | if (argv[1] && is_prefixed_with(argv[0], "busybox")) {
|
---|
[3232] | 951 | /* "busybox <applet> <params>" should still work as expected */
|
---|
| 952 | argv++;
|
---|
| 953 | }
|
---|
[2725] | 954 | /* applet_names in this case is just "applet\0\0" */
|
---|
| 955 | lbb_prepare(applet_names IF_FEATURE_INDIVIDUAL(, argv));
|
---|
| 956 | return SINGLE_APPLET_MAIN(argc, argv);
|
---|
| 957 | #else
|
---|
| 958 | lbb_prepare("busybox" IF_FEATURE_INDIVIDUAL(, argv));
|
---|
| 959 |
|
---|
[3621] | 960 | #if !ENABLE_BUSYBOX
|
---|
| 961 | if (argv[1] && is_prefixed_with(bb_basename(argv[0]), "busybox"))
|
---|
| 962 | argv++;
|
---|
| 963 | #endif
|
---|
[2725] | 964 | applet_name = argv[0];
|
---|
| 965 | if (applet_name[0] == '-')
|
---|
| 966 | applet_name++;
|
---|
| 967 | applet_name = bb_basename(applet_name);
|
---|
| 968 |
|
---|
| 969 | parse_config_file(); /* ...maybe, if FEATURE_SUID_CONFIG */
|
---|
| 970 |
|
---|
| 971 | run_applet_and_exit(applet_name, argv);
|
---|
| 972 | #endif
|
---|
| 973 | }
|
---|