[3320] | 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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| 30 | #include <assert.h>
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| 31 | #include <malloc.h>
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| 32 | /* Try to pull in PAGE_SIZE */
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| 33 | #ifdef __linux__
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| 34 | # include <sys/user.h>
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| 35 | #endif
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| 36 | #ifdef __GNU__ /* Hurd */
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| 37 | # include <mach/vm_param.h>
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| 38 | #endif
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| 39 |
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| 40 |
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| 41 | /* Declare <applet>_main() */
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| 42 | #define PROTOTYPES
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| 43 | #include "applets.h"
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| 44 | #undef PROTOTYPES
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| 45 |
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| 46 |
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| 47 | /* Include generated applet names, pointers to <applet>_main, etc */
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| 48 | #include "applet_tables.h"
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| 49 | /* ...and if applet_tables generator says we have only one applet... */
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| 50 | #ifdef SINGLE_APPLET_MAIN
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| 51 | # undef ENABLE_FEATURE_INDIVIDUAL
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| 52 | # define ENABLE_FEATURE_INDIVIDUAL 1
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| 53 | # undef IF_FEATURE_INDIVIDUAL
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| 54 | # define IF_FEATURE_INDIVIDUAL(...) __VA_ARGS__
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| 55 | #endif
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| 56 |
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| 57 |
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| 58 | #include "usage_compressed.h"
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| 59 |
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| 60 | #if ENABLE_SHOW_USAGE && !ENABLE_FEATURE_COMPRESS_USAGE
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| 61 | static const char usage_messages[] ALIGN1 = UNPACKED_USAGE;
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| 62 | #else
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| 63 | # define usage_messages 0
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| 64 | #endif
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| 65 |
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| 66 | #if ENABLE_FEATURE_COMPRESS_USAGE
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| 67 |
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| 68 | static const char packed_usage[] ALIGN1 = { PACKED_USAGE };
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| 69 | # include "archive.h"
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| 70 | static const char *unpack_usage_messages(void)
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| 71 | {
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| 72 | char *outbuf = NULL;
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| 73 | bunzip_data *bd;
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| 74 | int i;
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| 75 |
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| 76 | i = start_bunzip(&bd,
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| 77 | /* src_fd: */ -1,
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| 78 | /* inbuf: */ packed_usage,
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| 79 | /* len: */ sizeof(packed_usage));
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| 80 | /* read_bunzip can longjmp to start_bunzip, and ultimately
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| 81 | * end up here with i != 0 on read data errors! Not trivial */
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| 82 | if (!i) {
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| 83 | /* Cannot use xmalloc: will leak bd in NOFORK case! */
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| 84 | outbuf = malloc_or_warn(sizeof(UNPACKED_USAGE));
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| 85 | if (outbuf)
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| 86 | read_bunzip(bd, outbuf, sizeof(UNPACKED_USAGE));
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| 87 | }
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| 88 | dealloc_bunzip(bd);
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| 89 | return outbuf;
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| 90 | }
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| 91 | # define dealloc_usage_messages(s) free(s)
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| 92 |
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| 93 | #else
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| 94 |
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| 95 | # define unpack_usage_messages() usage_messages
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| 96 | # define dealloc_usage_messages(s) ((void)(s))
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| 97 |
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| 98 | #endif /* FEATURE_COMPRESS_USAGE */
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| 99 |
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| 100 |
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| 101 | void FAST_FUNC bb_show_usage(void)
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| 102 | {
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| 103 | if (ENABLE_SHOW_USAGE) {
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| 104 | #ifdef SINGLE_APPLET_STR
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| 105 | /* Imagine that this applet is "true". Dont suck in printf! */
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| 106 | const char *usage_string = unpack_usage_messages();
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| 107 |
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| 108 | if (*usage_string == '\b') {
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| 109 | full_write2_str("No help available.\n\n");
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| 110 | } else {
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| 111 | full_write2_str("Usage: "SINGLE_APPLET_STR" ");
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| 112 | full_write2_str(usage_string);
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| 113 | full_write2_str("\n\n");
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| 114 | }
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| 115 | if (ENABLE_FEATURE_CLEAN_UP)
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| 116 | dealloc_usage_messages((char*)usage_string);
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| 117 | #else
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| 118 | const char *p;
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| 119 | const char *usage_string = p = unpack_usage_messages();
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| 120 | int ap = find_applet_by_name(applet_name);
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| 121 |
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| 122 | if (ap < 0) /* never happens, paranoia */
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| 123 | xfunc_die();
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| 124 | while (ap) {
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| 125 | while (*p++) continue;
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| 126 | ap--;
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| 127 | }
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| 128 | full_write2_str(bb_banner);
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| 129 | full_write2_str(" multi-call binary.\n");
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| 130 | if (*p == '\b')
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| 131 | full_write2_str("\nNo help available.\n\n");
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| 132 | else {
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| 133 | full_write2_str("\nUsage: ");
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| 134 | full_write2_str(applet_name);
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| 135 | full_write2_str(" ");
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| 136 | full_write2_str(p);
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| 137 | full_write2_str("\n\n");
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| 138 | }
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| 139 | if (ENABLE_FEATURE_CLEAN_UP)
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| 140 | dealloc_usage_messages((char*)usage_string);
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| 141 | #endif
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| 142 | }
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| 143 | xfunc_die();
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| 144 | }
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| 145 |
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| 146 | #if NUM_APPLETS > 8
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| 147 | /* NB: any char pointer will work as well, not necessarily applet_names */
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| 148 | static int applet_name_compare(const void *name, const void *v)
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| 149 | {
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| 150 | int i = (const char *)v - applet_names;
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| 151 | return strcmp(name, APPLET_NAME(i));
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| 152 | }
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| 153 | #endif
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| 154 | int FAST_FUNC find_applet_by_name(const char *name)
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| 155 | {
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| 156 | #if NUM_APPLETS > 8
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| 157 | /* Do a binary search to find the applet entry given the name. */
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| 158 | const char *p;
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| 159 | p = bsearch(name, applet_names, ARRAY_SIZE(applet_main), 1, applet_name_compare);
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| 160 | if (!p)
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| 161 | return -1;
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| 162 | return p - applet_names;
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| 163 | #else
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| 164 | /* A version which does not pull in bsearch */
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| 165 | int i = 0;
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| 166 | const char *p = applet_names;
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| 167 | while (i < NUM_APPLETS) {
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| 168 | if (strcmp(name, p) == 0)
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| 169 | return i;
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| 170 | p += strlen(p) + 1;
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| 171 | i++;
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| 172 | }
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| 173 | return -1;
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| 174 | #endif
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| 175 | }
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| 176 |
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| 177 |
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| 178 | void lbb_prepare(const char *applet
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| 179 | IF_FEATURE_INDIVIDUAL(, char **argv))
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| 180 | MAIN_EXTERNALLY_VISIBLE;
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| 181 | void lbb_prepare(const char *applet
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| 182 | IF_FEATURE_INDIVIDUAL(, char **argv))
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| 183 | {
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| 184 | #ifdef __GLIBC__
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| 185 | (*(int **)&bb_errno) = __errno_location();
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| 186 | barrier();
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| 187 | #endif
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| 188 | applet_name = applet;
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| 189 |
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| 190 | /* Set locale for everybody except 'init' */
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| 191 | if (ENABLE_LOCALE_SUPPORT && getpid() != 1)
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| 192 | setlocale(LC_ALL, "");
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| 193 |
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| 194 | #if ENABLE_FEATURE_INDIVIDUAL
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| 195 | /* Redundant for busybox (run_applet_and_exit covers that case)
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| 196 | * but needed for "individual applet" mode */
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| 197 | if (argv[1]
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| 198 | && !argv[2]
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| 199 | && strcmp(argv[1], "--help") == 0
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| 200 | && strncmp(applet, "busybox", 7) != 0
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| 201 | ) {
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| 202 | /* Special case. POSIX says "test --help"
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| 203 | * should be no different from e.g. "test --foo". */
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| 204 | if (!ENABLE_TEST || strcmp(applet_name, "test") != 0)
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| 205 | bb_show_usage();
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| 206 | }
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| 207 | #endif
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| 208 | }
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| 209 |
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| 210 | /* The code below can well be in applets/applets.c, as it is used only
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| 211 | * for busybox binary, not "individual" binaries.
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| 212 | * However, keeping it here and linking it into libbusybox.so
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| 213 | * (together with remaining tiny applets/applets.o)
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| 214 | * makes it possible to avoid --whole-archive at link time.
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| 215 | * This makes (shared busybox) + libbusybox smaller.
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| 216 | * (--gc-sections would be even better....)
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| 217 | */
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| 218 |
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| 219 | const char *applet_name;
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| 220 | #if !BB_MMU
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| 221 | bool re_execed;
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| 222 | #endif
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| 223 |
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| 224 |
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| 225 | /* If not built as a single-applet executable... */
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| 226 | #if !defined(SINGLE_APPLET_MAIN)
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| 227 |
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| 228 | IF_FEATURE_SUID(static uid_t ruid;) /* real uid */
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| 229 |
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| 230 | #if ENABLE_FEATURE_SUID_CONFIG
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| 231 |
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| 232 | /* applets[] is const, so we have to define this "override" structure */
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| 233 | static struct BB_suid_config {
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| 234 | int m_applet;
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| 235 | uid_t m_uid;
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| 236 | gid_t m_gid;
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| 237 | mode_t m_mode;
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| 238 | struct BB_suid_config *m_next;
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| 239 | } *suid_config;
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| 240 |
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| 241 | static bool suid_cfg_readable;
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| 242 |
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| 243 | /* check if u is member of group g */
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| 244 | static int ingroup(uid_t u, gid_t g)
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| 245 | {
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| 246 | struct group *grp = getgrgid(g);
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| 247 |
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| 248 | if (grp) {
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| 249 | char **mem;
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| 250 |
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| 251 | for (mem = grp->gr_mem; *mem; mem++) {
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| 252 | struct passwd *pwd = getpwnam(*mem);
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| 253 |
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| 254 | if (pwd && (pwd->pw_uid == u))
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| 255 | return 1;
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| 256 | }
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| 257 | }
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| 258 | return 0;
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| 259 | }
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| 260 |
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| 261 | /* This should probably be a libbb routine. In that case,
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| 262 | * I'd probably rename it to something like bb_trimmed_slice.
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| 263 | */
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| 264 | static char *get_trimmed_slice(char *s, char *e)
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| 265 | {
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| 266 | /* First, consider the value at e to be nul and back up until we
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| 267 | * reach a non-space char. Set the char after that (possibly at
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| 268 | * the original e) to nul. */
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| 269 | while (e-- > s) {
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| 270 | if (!isspace(*e)) {
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| 271 | break;
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| 272 | }
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| 273 | }
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| 274 | e[1] = '\0';
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| 275 |
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| 276 | /* Next, advance past all leading space and return a ptr to the
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| 277 | * first non-space char; possibly the terminating nul. */
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| 278 | return skip_whitespace(s);
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| 279 | }
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| 280 |
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| 281 | /* Don't depend on the tools to combine strings. */
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| 282 | static const char config_file[] ALIGN1 = "/etc/busybox.conf";
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| 283 |
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| 284 | /* We don't supply a value for the nul, so an index adjustment is
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| 285 | * necessary below. Also, we use unsigned short here to save some
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| 286 | * space even though these are really mode_t values. */
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| 287 | static const unsigned short mode_mask[] ALIGN2 = {
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| 288 | /* SST sst xxx --- */
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| 289 | S_ISUID, S_ISUID|S_IXUSR, S_IXUSR, 0, /* user */
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| 290 | S_ISGID, S_ISGID|S_IXGRP, S_IXGRP, 0, /* group */
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| 291 | 0, S_IXOTH, S_IXOTH, 0 /* other */
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| 292 | };
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| 293 |
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| 294 | #define parse_error(x) do { errmsg = x; goto pe_label; } while (0)
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| 295 |
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| 296 | static void parse_config_file(void)
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| 297 | {
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| 298 | struct BB_suid_config *sct_head;
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| 299 | struct BB_suid_config *sct;
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| 300 | int applet_no;
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| 301 | FILE *f;
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| 302 | const char *errmsg;
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| 303 | char *s;
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| 304 | char *e;
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| 305 | int i;
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| 306 | unsigned lc;
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| 307 | smallint section;
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| 308 | char buffer[256];
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| 309 | struct stat st;
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| 310 |
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| 311 | assert(!suid_config); /* Should be set to NULL by bss init. */
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| 312 |
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| 313 | ruid = getuid();
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| 314 | if (ruid == 0) /* run by root - don't need to even read config file */
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| 315 | return;
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| 316 |
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| 317 | if ((stat(config_file, &st) != 0) /* No config file? */
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| 318 | || !S_ISREG(st.st_mode) /* Not a regular file? */
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| 319 | || (st.st_uid != 0) /* Not owned by root? */
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| 320 | || (st.st_mode & (S_IWGRP | S_IWOTH)) /* Writable by non-root? */
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| 321 | || !(f = fopen_for_read(config_file)) /* Cannot open? */
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| 322 | ) {
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| 323 | return;
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| 324 | }
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| 325 |
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| 326 | suid_cfg_readable = 1;
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| 327 | sct_head = NULL;
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| 328 | section = lc = 0;
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| 329 |
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| 330 | while (1) {
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| 331 | s = buffer;
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| 332 |
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| 333 | if (!fgets(s, sizeof(buffer), f)) { /* Are we done? */
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| 334 | // why?
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| 335 | if (ferror(f)) { /* Make sure it wasn't a read error. */
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| 336 | parse_error("reading");
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| 337 | }
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| 338 | fclose(f);
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| 339 | suid_config = sct_head; /* Success, so set the pointer. */
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| 340 | return;
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| 341 | }
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| 342 |
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| 343 | lc++; /* Got a (partial) line. */
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| 344 |
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| 345 | /* If a line is too long for our buffer, we consider it an error.
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| 346 | * The following test does mistreat one corner case though.
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| 347 | * If the final line of the file does not end with a newline and
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| 348 | * yet exactly fills the buffer, it will be treated as too long
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| 349 | * even though there isn't really a problem. But it isn't really
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| 350 | * worth adding code to deal with such an unlikely situation, and
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| 351 | * we do err on the side of caution. Besides, the line would be
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| 352 | * too long if it did end with a newline. */
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| 353 | if (!strchr(s, '\n') && !feof(f)) {
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| 354 | parse_error("line too long");
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| 355 | }
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| 356 |
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| 357 | /* Trim leading and trailing whitespace, ignoring comments, and
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| 358 | * check if the resulting string is empty. */
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| 359 | s = get_trimmed_slice(s, strchrnul(s, '#'));
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| 360 | if (!*s) {
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| 361 | continue;
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| 362 | }
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| 363 |
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| 364 | /* Check for a section header. */
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| 365 |
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| 366 | if (*s == '[') {
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| 367 | /* Unlike the old code, we ignore leading and trailing
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| 368 | * whitespace for the section name. We also require that
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| 369 | * there are no stray characters after the closing bracket. */
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| 370 | e = strchr(s, ']');
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| 371 | if (!e /* Missing right bracket? */
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| 372 | || e[1] /* Trailing characters? */
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| 373 | || !*(s = get_trimmed_slice(s+1, e)) /* Missing name? */
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| 374 | ) {
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| 375 | parse_error("section header");
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| 376 | }
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| 377 | /* Right now we only have one section so just check it.
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| 378 | * If more sections are added in the future, please don't
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| 379 | * resort to cascading ifs with multiple strcasecmp calls.
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| 380 | * That kind of bloated code is all too common. A loop
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| 381 | * and a string table would be a better choice unless the
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| 382 | * number of sections is very small. */
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| 383 | if (strcasecmp(s, "SUID") == 0) {
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| 384 | section = 1;
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| 385 | continue;
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| 386 | }
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| 387 | section = -1; /* Unknown section so set to skip. */
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| 388 | continue;
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| 389 | }
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| 390 |
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| 391 | /* Process sections. */
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| 392 |
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| 393 | if (section == 1) { /* SUID */
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| 394 | /* Since we trimmed leading and trailing space above, we're
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| 395 | * now looking for strings of the form
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| 396 | * <key>[::space::]*=[::space::]*<value>
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| 397 | * where both key and value could contain inner whitespace. */
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| 398 |
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| 399 | /* First get the key (an applet name in our case). */
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| 400 | e = strchr(s, '=');
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| 401 | if (e) {
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| 402 | s = get_trimmed_slice(s, e);
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| 403 | }
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| 404 | if (!e || !*s) { /* Missing '=' or empty key. */
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| 405 | parse_error("keyword");
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| 406 | }
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| 407 |
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| 408 | /* Ok, we have an applet name. Process the rhs if this
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| 409 | * applet is currently built in and ignore it otherwise.
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| 410 | * Note: this can hide config file bugs which only pop
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| 411 | * up when the busybox configuration is changed. */
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| 412 | applet_no = find_applet_by_name(s);
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| 413 | if (applet_no >= 0) {
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| 414 | /* Note: We currently don't check for duplicates!
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| 415 | * The last config line for each applet will be the
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| 416 | * one used since we insert at the head of the list.
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| 417 | * I suppose this could be considered a feature. */
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| 418 | sct = xmalloc(sizeof(struct BB_suid_config));
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| 419 | sct->m_applet = applet_no;
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| 420 | sct->m_mode = 0;
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| 421 | sct->m_next = sct_head;
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| 422 | sct_head = sct;
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| 423 |
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| 424 | /* Get the specified mode. */
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| 425 |
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| 426 | e = skip_whitespace(e+1);
|
---|
| 427 |
|
---|
| 428 | for (i = 0; i < 3; i++) {
|
---|
| 429 | /* There are 4 chars + 1 nul for each of user/group/other. */
|
---|
| 430 | static const char mode_chars[] ALIGN1 = "Ssx-\0" "Ssx-\0" "Ttx-";
|
---|
| 431 |
|
---|
| 432 | const char *q;
|
---|
| 433 | q = strchrnul(mode_chars + 5*i, *e++);
|
---|
| 434 | if (!*q) {
|
---|
| 435 | parse_error("mode");
|
---|
| 436 | }
|
---|
| 437 | /* Adjust by -i to account for nul. */
|
---|
| 438 | sct->m_mode |= mode_mask[(q - mode_chars) - i];
|
---|
| 439 | }
|
---|
| 440 |
|
---|
| 441 | /* Now get the the user/group info. */
|
---|
| 442 |
|
---|
| 443 | s = skip_whitespace(e);
|
---|
| 444 |
|
---|
| 445 | /* Note: we require whitespace between the mode and the
|
---|
| 446 | * user/group info. */
|
---|
| 447 | if ((s == e) || !(e = strchr(s, '.'))) {
|
---|
| 448 | parse_error("<uid>.<gid>");
|
---|
| 449 | }
|
---|
| 450 | *e++ = '\0';
|
---|
| 451 |
|
---|
| 452 | /* We can't use get_ug_id here since it would exit()
|
---|
| 453 | * if a uid or gid was not found. Oh well... */
|
---|
| 454 | sct->m_uid = bb_strtoul(s, NULL, 10);
|
---|
| 455 | if (errno) {
|
---|
| 456 | struct passwd *pwd = getpwnam(s);
|
---|
| 457 | if (!pwd) {
|
---|
| 458 | parse_error("user");
|
---|
| 459 | }
|
---|
| 460 | sct->m_uid = pwd->pw_uid;
|
---|
| 461 | }
|
---|
| 462 |
|
---|
| 463 | sct->m_gid = bb_strtoul(e, NULL, 10);
|
---|
| 464 | if (errno) {
|
---|
| 465 | struct group *grp;
|
---|
| 466 | grp = getgrnam(e);
|
---|
| 467 | if (!grp) {
|
---|
| 468 | parse_error("group");
|
---|
| 469 | }
|
---|
| 470 | sct->m_gid = grp->gr_gid;
|
---|
| 471 | }
|
---|
| 472 | }
|
---|
| 473 | continue;
|
---|
| 474 | }
|
---|
| 475 |
|
---|
| 476 | /* Unknown sections are ignored. */
|
---|
| 477 |
|
---|
| 478 | /* Encountering configuration lines prior to seeing a
|
---|
| 479 | * section header is treated as an error. This is how
|
---|
| 480 | * the old code worked, but it may not be desirable.
|
---|
| 481 | * We may want to simply ignore such lines in case they
|
---|
| 482 | * are used in some future version of busybox. */
|
---|
| 483 | if (!section) {
|
---|
| 484 | parse_error("keyword outside section");
|
---|
| 485 | }
|
---|
| 486 |
|
---|
| 487 | } /* while (1) */
|
---|
| 488 |
|
---|
| 489 | pe_label:
|
---|
| 490 | fprintf(stderr, "Parse error in %s, line %d: %s\n",
|
---|
| 491 | config_file, lc, errmsg);
|
---|
| 492 |
|
---|
| 493 | fclose(f);
|
---|
| 494 | /* Release any allocated memory before returning. */
|
---|
| 495 | while (sct_head) {
|
---|
| 496 | sct = sct_head->m_next;
|
---|
| 497 | free(sct_head);
|
---|
| 498 | sct_head = sct;
|
---|
| 499 | }
|
---|
| 500 | }
|
---|
| 501 | #else
|
---|
| 502 | static inline void parse_config_file(void)
|
---|
| 503 | {
|
---|
| 504 | IF_FEATURE_SUID(ruid = getuid();)
|
---|
| 505 | }
|
---|
| 506 | #endif /* FEATURE_SUID_CONFIG */
|
---|
| 507 |
|
---|
| 508 |
|
---|
| 509 | #if ENABLE_FEATURE_SUID
|
---|
| 510 | static void check_suid(int applet_no)
|
---|
| 511 | {
|
---|
| 512 | gid_t rgid; /* real gid */
|
---|
| 513 |
|
---|
| 514 | if (ruid == 0) /* set by parse_config_file() */
|
---|
| 515 | return; /* run by root - no need to check more */
|
---|
| 516 | rgid = getgid();
|
---|
| 517 |
|
---|
| 518 | #if ENABLE_FEATURE_SUID_CONFIG
|
---|
| 519 | if (suid_cfg_readable) {
|
---|
| 520 | uid_t uid;
|
---|
| 521 | struct BB_suid_config *sct;
|
---|
| 522 | mode_t m;
|
---|
| 523 |
|
---|
| 524 | for (sct = suid_config; sct; sct = sct->m_next) {
|
---|
| 525 | if (sct->m_applet == applet_no)
|
---|
| 526 | goto found;
|
---|
| 527 | }
|
---|
| 528 | goto check_need_suid;
|
---|
| 529 | found:
|
---|
| 530 | m = sct->m_mode;
|
---|
| 531 | if (sct->m_uid == ruid)
|
---|
| 532 | /* same uid */
|
---|
| 533 | m >>= 6;
|
---|
| 534 | else if ((sct->m_gid == rgid) || ingroup(ruid, sct->m_gid))
|
---|
| 535 | /* same group / in group */
|
---|
| 536 | m >>= 3;
|
---|
| 537 |
|
---|
| 538 | if (!(m & S_IXOTH)) /* is x bit not set ? */
|
---|
| 539 | bb_error_msg_and_die("you have no permission to run this applet!");
|
---|
| 540 |
|
---|
| 541 | /* _both_ sgid and group_exec have to be set for setegid */
|
---|
| 542 | if ((sct->m_mode & (S_ISGID | S_IXGRP)) == (S_ISGID | S_IXGRP))
|
---|
| 543 | rgid = sct->m_gid;
|
---|
| 544 | /* else (no setegid) we will set egid = rgid */
|
---|
| 545 |
|
---|
| 546 | /* We set effective AND saved ids. If saved-id is not set
|
---|
| 547 | * like we do below, seteiud(0) can still later succeed! */
|
---|
| 548 | if (setresgid(-1, rgid, rgid))
|
---|
| 549 | bb_perror_msg_and_die("setresgid");
|
---|
| 550 |
|
---|
| 551 | /* do we have to set effective uid? */
|
---|
| 552 | uid = ruid;
|
---|
| 553 | if (sct->m_mode & S_ISUID)
|
---|
| 554 | uid = sct->m_uid;
|
---|
| 555 | /* else (no seteuid) we will set euid = ruid */
|
---|
| 556 |
|
---|
| 557 | if (setresuid(-1, uid, uid))
|
---|
| 558 | bb_perror_msg_and_die("setresuid");
|
---|
| 559 | return;
|
---|
| 560 | }
|
---|
| 561 | #if !ENABLE_FEATURE_SUID_CONFIG_QUIET
|
---|
| 562 | {
|
---|
| 563 | static bool onetime = 0;
|
---|
| 564 |
|
---|
| 565 | if (!onetime) {
|
---|
| 566 | onetime = 1;
|
---|
| 567 | fprintf(stderr, "Using fallback suid method\n");
|
---|
| 568 | }
|
---|
| 569 | }
|
---|
| 570 | #endif
|
---|
| 571 | check_need_suid:
|
---|
| 572 | #endif
|
---|
| 573 | if (APPLET_SUID(applet_no) == _BB_SUID_REQUIRE) {
|
---|
| 574 | /* Real uid is not 0. If euid isn't 0 too, suid bit
|
---|
| 575 | * is most probably not set on our executable */
|
---|
| 576 | if (geteuid())
|
---|
| 577 | bb_error_msg_and_die("must be suid to work properly");
|
---|
| 578 | } else if (APPLET_SUID(applet_no) == _BB_SUID_DROP) {
|
---|
| 579 | xsetgid(rgid); /* drop all privileges */
|
---|
| 580 | xsetuid(ruid);
|
---|
| 581 | }
|
---|
| 582 | }
|
---|
| 583 | #else
|
---|
| 584 | #define check_suid(x) ((void)0)
|
---|
| 585 | #endif /* FEATURE_SUID */
|
---|
| 586 |
|
---|
| 587 |
|
---|
| 588 | #if ENABLE_FEATURE_INSTALLER
|
---|
| 589 | static const char usr_bin [] ALIGN1 = "/usr/bin/";
|
---|
| 590 | static const char usr_sbin[] ALIGN1 = "/usr/sbin/";
|
---|
| 591 | static const char *const install_dir[] = {
|
---|
| 592 | &usr_bin [8], /* "/" */
|
---|
| 593 | &usr_bin [4], /* "/bin/" */
|
---|
| 594 | &usr_sbin[4] /* "/sbin/" */
|
---|
| 595 | # if !ENABLE_INSTALL_NO_USR
|
---|
| 596 | ,usr_bin
|
---|
| 597 | ,usr_sbin
|
---|
| 598 | # endif
|
---|
| 599 | };
|
---|
| 600 |
|
---|
| 601 |
|
---|
| 602 | /* create (sym)links for each applet */
|
---|
| 603 | static void install_links(const char *busybox, int use_symbolic_links,
|
---|
| 604 | char *custom_install_dir)
|
---|
| 605 | {
|
---|
| 606 | /* directory table
|
---|
| 607 | * this should be consistent w/ the enum,
|
---|
| 608 | * busybox.h::bb_install_loc_t, or else... */
|
---|
| 609 | int (*lf)(const char *, const char *);
|
---|
| 610 | char *fpc;
|
---|
| 611 | unsigned i;
|
---|
| 612 | int rc;
|
---|
| 613 |
|
---|
| 614 | lf = link;
|
---|
| 615 | if (use_symbolic_links)
|
---|
| 616 | lf = symlink;
|
---|
| 617 |
|
---|
| 618 | for (i = 0; i < ARRAY_SIZE(applet_main); i++) {
|
---|
| 619 | fpc = concat_path_file(
|
---|
| 620 | custom_install_dir ? custom_install_dir : install_dir[APPLET_INSTALL_LOC(i)],
|
---|
| 621 | APPLET_NAME(i));
|
---|
| 622 | // debug: bb_error_msg("%slinking %s to busybox",
|
---|
| 623 | // use_symbolic_links ? "sym" : "", fpc);
|
---|
| 624 | rc = lf(busybox, fpc);
|
---|
| 625 | if (rc != 0 && errno != EEXIST) {
|
---|
| 626 | bb_simple_perror_msg(fpc);
|
---|
| 627 | }
|
---|
| 628 | free(fpc);
|
---|
| 629 | }
|
---|
| 630 | }
|
---|
| 631 | #else
|
---|
| 632 | # define install_links(x,y,z) ((void)0)
|
---|
| 633 | #endif
|
---|
| 634 |
|
---|
| 635 | /* If we were called as "busybox..." */
|
---|
| 636 | static int busybox_main(char **argv)
|
---|
| 637 | {
|
---|
| 638 | if (!argv[1]) {
|
---|
| 639 | /* Called without arguments */
|
---|
| 640 | const char *a;
|
---|
| 641 | int col;
|
---|
| 642 | unsigned output_width;
|
---|
| 643 | help:
|
---|
| 644 | output_width = 80;
|
---|
| 645 | if (ENABLE_FEATURE_AUTOWIDTH) {
|
---|
| 646 | /* Obtain the terminal width */
|
---|
| 647 | get_terminal_width_height(0, &output_width, NULL);
|
---|
| 648 | }
|
---|
| 649 |
|
---|
| 650 | dup2(1, 2);
|
---|
| 651 | full_write2_str(bb_banner); /* reuse const string */
|
---|
| 652 | full_write2_str(" multi-call binary.\n"); /* reuse */
|
---|
| 653 | full_write2_str(
|
---|
| 654 | "Copyright (C) 1998-2009 Erik Andersen, Rob Landley, Denys Vlasenko\n"
|
---|
| 655 | "and others. Licensed under GPLv2.\n"
|
---|
| 656 | "See source distribution for full notice.\n"
|
---|
| 657 | "\n"
|
---|
| 658 | "Usage: busybox [function] [arguments]...\n"
|
---|
| 659 | " or: busybox --list[-full]\n"
|
---|
| 660 | " or: function [arguments]...\n"
|
---|
| 661 | "\n"
|
---|
| 662 | "\tBusyBox is a multi-call binary that combines many common Unix\n"
|
---|
| 663 | "\tutilities into a single executable. Most people will create a\n"
|
---|
| 664 | "\tlink to busybox for each function they wish to use and BusyBox\n"
|
---|
| 665 | "\twill act like whatever it was invoked as.\n"
|
---|
| 666 | "\n"
|
---|
| 667 | "Currently defined functions:\n"
|
---|
| 668 | );
|
---|
| 669 | col = 0;
|
---|
| 670 | a = applet_names;
|
---|
| 671 | /* prevent last comma to be in the very last pos */
|
---|
| 672 | output_width--;
|
---|
| 673 | while (*a) {
|
---|
| 674 | int len2 = strlen(a) + 2;
|
---|
| 675 | if (col >= (int)output_width - len2) {
|
---|
| 676 | full_write2_str(",\n");
|
---|
| 677 | col = 0;
|
---|
| 678 | }
|
---|
| 679 | if (col == 0) {
|
---|
| 680 | col = 6;
|
---|
| 681 | full_write2_str("\t");
|
---|
| 682 | } else {
|
---|
| 683 | full_write2_str(", ");
|
---|
| 684 | }
|
---|
| 685 | full_write2_str(a);
|
---|
| 686 | col += len2;
|
---|
| 687 | a += len2 - 1;
|
---|
| 688 | }
|
---|
| 689 | full_write2_str("\n\n");
|
---|
| 690 | return 0;
|
---|
| 691 | }
|
---|
| 692 |
|
---|
| 693 | if (strncmp(argv[1], "--list", 6) == 0) {
|
---|
| 694 | unsigned i = 0;
|
---|
| 695 | const char *a = applet_names;
|
---|
| 696 | dup2(1, 2);
|
---|
| 697 | while (*a) {
|
---|
| 698 | #if ENABLE_FEATURE_INSTALLER
|
---|
| 699 | if (argv[1][6]) /* --list-path? */
|
---|
| 700 | full_write2_str(install_dir[APPLET_INSTALL_LOC(i)] + 1);
|
---|
| 701 | #endif
|
---|
| 702 | full_write2_str(a);
|
---|
| 703 | full_write2_str("\n");
|
---|
| 704 | i++;
|
---|
| 705 | a += strlen(a) + 1;
|
---|
| 706 | }
|
---|
| 707 | return 0;
|
---|
| 708 | }
|
---|
| 709 |
|
---|
| 710 | if (ENABLE_FEATURE_INSTALLER && strcmp(argv[1], "--install") == 0) {
|
---|
| 711 | int use_symbolic_links;
|
---|
| 712 | const char *busybox;
|
---|
| 713 | busybox = xmalloc_readlink(bb_busybox_exec_path);
|
---|
| 714 | if (!busybox)
|
---|
| 715 | busybox = bb_busybox_exec_path;
|
---|
| 716 | /* busybox --install [-s] [DIR]: */
|
---|
| 717 | /* -s: make symlinks */
|
---|
| 718 | /* DIR: directory to install links to */
|
---|
| 719 | use_symbolic_links = (argv[2] && strcmp(argv[2], "-s") == 0 && argv++);
|
---|
| 720 | install_links(busybox, use_symbolic_links, argv[2]);
|
---|
| 721 | return 0;
|
---|
| 722 | }
|
---|
| 723 |
|
---|
| 724 | if (strcmp(argv[1], "--help") == 0) {
|
---|
| 725 | /* "busybox --help [<applet>]" */
|
---|
| 726 | if (!argv[2])
|
---|
| 727 | goto help;
|
---|
| 728 | /* convert to "<applet> --help" */
|
---|
| 729 | argv[0] = argv[2];
|
---|
| 730 | argv[2] = NULL;
|
---|
| 731 | } else {
|
---|
| 732 | /* "busybox <applet> arg1 arg2 ..." */
|
---|
| 733 | argv++;
|
---|
| 734 | }
|
---|
| 735 | /* We support "busybox /a/path/to/applet args..." too. Allows for
|
---|
| 736 | * "#!/bin/busybox"-style wrappers */
|
---|
| 737 | applet_name = bb_get_last_path_component_nostrip(argv[0]);
|
---|
| 738 | run_applet_and_exit(applet_name, argv);
|
---|
| 739 |
|
---|
| 740 | /*bb_error_msg_and_die("applet not found"); - sucks in printf */
|
---|
| 741 | full_write2_str(applet_name);
|
---|
| 742 | full_write2_str(": applet not found\n");
|
---|
| 743 | xfunc_die();
|
---|
| 744 | }
|
---|
| 745 |
|
---|
| 746 | void FAST_FUNC run_applet_no_and_exit(int applet_no, char **argv)
|
---|
| 747 | {
|
---|
| 748 | int argc = 1;
|
---|
| 749 |
|
---|
| 750 | while (argv[argc])
|
---|
| 751 | argc++;
|
---|
| 752 |
|
---|
| 753 | /* Reinit some shared global data */
|
---|
| 754 | xfunc_error_retval = EXIT_FAILURE;
|
---|
| 755 |
|
---|
| 756 | applet_name = APPLET_NAME(applet_no);
|
---|
| 757 | if (argc == 2 && strcmp(argv[1], "--help") == 0) {
|
---|
| 758 | /* Special case. POSIX says "test --help"
|
---|
| 759 | * should be no different from e.g. "test --foo". */
|
---|
| 760 | //TODO: just compare applet_no with APPLET_NO_test
|
---|
| 761 | if (!ENABLE_TEST || strcmp(applet_name, "test") != 0)
|
---|
| 762 | bb_show_usage();
|
---|
| 763 | }
|
---|
| 764 | if (ENABLE_FEATURE_SUID)
|
---|
| 765 | check_suid(applet_no);
|
---|
| 766 | exit(applet_main[applet_no](argc, argv));
|
---|
| 767 | }
|
---|
| 768 |
|
---|
| 769 | void FAST_FUNC run_applet_and_exit(const char *name, char **argv)
|
---|
| 770 | {
|
---|
| 771 | int applet = find_applet_by_name(name);
|
---|
| 772 | if (applet >= 0)
|
---|
| 773 | run_applet_no_and_exit(applet, argv);
|
---|
| 774 | if (!strncmp(name, "busybox", 7))
|
---|
| 775 | exit(busybox_main(argv));
|
---|
| 776 | }
|
---|
| 777 |
|
---|
| 778 | #endif /* !defined(SINGLE_APPLET_MAIN) */
|
---|
| 779 |
|
---|
| 780 |
|
---|
| 781 |
|
---|
| 782 | #if ENABLE_BUILD_LIBBUSYBOX
|
---|
| 783 | int lbb_main(char **argv)
|
---|
| 784 | #else
|
---|
| 785 | int main(int argc UNUSED_PARAM, char **argv)
|
---|
| 786 | #endif
|
---|
| 787 | {
|
---|
| 788 | /* Tweak malloc for reduced memory consumption */
|
---|
| 789 | #ifndef PAGE_SIZE
|
---|
| 790 | # define PAGE_SIZE (4*1024) /* guess */
|
---|
| 791 | #endif
|
---|
| 792 | #ifdef M_TRIM_THRESHOLD
|
---|
| 793 | /* M_TRIM_THRESHOLD is the maximum amount of freed top-most memory
|
---|
| 794 | * to keep before releasing to the OS
|
---|
| 795 | * Default is way too big: 256k
|
---|
| 796 | */
|
---|
| 797 | mallopt(M_TRIM_THRESHOLD, 2 * PAGE_SIZE);
|
---|
| 798 | #endif
|
---|
| 799 | #ifdef M_MMAP_THRESHOLD
|
---|
| 800 | /* M_MMAP_THRESHOLD is the request size threshold for using mmap()
|
---|
| 801 | * Default is too big: 256k
|
---|
| 802 | */
|
---|
| 803 | mallopt(M_MMAP_THRESHOLD, 8 * PAGE_SIZE - 256);
|
---|
| 804 | #endif
|
---|
| 805 |
|
---|
| 806 | #if defined(SINGLE_APPLET_MAIN)
|
---|
| 807 | /* Only one applet is selected by the user! */
|
---|
| 808 | /* applet_names in this case is just "applet\0\0" */
|
---|
| 809 | lbb_prepare(applet_names IF_FEATURE_INDIVIDUAL(, argv));
|
---|
| 810 | return SINGLE_APPLET_MAIN(argc, argv);
|
---|
| 811 | #else
|
---|
| 812 | lbb_prepare("busybox" IF_FEATURE_INDIVIDUAL(, argv));
|
---|
| 813 |
|
---|
| 814 | #if !BB_MMU
|
---|
| 815 | /* NOMMU re-exec trick sets high-order bit in first byte of name */
|
---|
| 816 | if (argv[0][0] & 0x80) {
|
---|
| 817 | re_execed = 1;
|
---|
| 818 | argv[0][0] &= 0x7f;
|
---|
| 819 | }
|
---|
| 820 | #endif
|
---|
| 821 | applet_name = argv[0];
|
---|
| 822 | if (applet_name[0] == '-')
|
---|
| 823 | applet_name++;
|
---|
| 824 | applet_name = bb_basename(applet_name);
|
---|
| 825 |
|
---|
| 826 | parse_config_file(); /* ...maybe, if FEATURE_SUID_CONFIG */
|
---|
| 827 |
|
---|
| 828 | run_applet_and_exit(applet_name, argv);
|
---|
| 829 |
|
---|
| 830 | /*bb_error_msg_and_die("applet not found"); - sucks in printf */
|
---|
| 831 | full_write2_str(applet_name);
|
---|
| 832 | full_write2_str(": applet not found\n");
|
---|
| 833 | xfunc_die();
|
---|
| 834 | #endif
|
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| 835 | }
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